Station detail: price above its age, and the verdict caption on its own line

- More info lists the fuel price first, with "Price updated" beneath it:
  the price is what the row is about, the age qualifies it.
- The detail sheet stacks "vs closest eligible station" under the verdict
  capsule, matching the listing rows, so the caption no longer shares a
  line with the verdict it describes.

FuelBoard.xcodeproj/project.pbxproj

@@ -533,7 +533,7 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_ENTITLEMENTS = Config/WatchApp.entitlements;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 26;
+				CURRENT_PROJECT_VERSION = 27;
 				DEVELOPMENT_TEAM = F3BE6NE7U3;
 				ENABLE_PREVIEWS = YES;
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
@@ -599,7 +599,7 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_ENTITLEMENTS = Config/WatchApp.entitlements;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 26;
+				CURRENT_PROJECT_VERSION = 27;
 				DEVELOPMENT_TEAM = F3BE6NE7U3;
 				ENABLE_PREVIEWS = YES;
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
@@ -663,7 +663,7 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 26;
+				CURRENT_PROJECT_VERSION = 27;
 				DEVELOPMENT_TEAM = F3BE6NE7U3;
 				ENABLE_PREVIEWS = YES;
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
@@ -728,7 +728,7 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 26;
+				CURRENT_PROJECT_VERSION = 27;
 				DEVELOPMENT_TEAM = F3BE6NE7U3;
 				ENABLE_PREVIEWS = YES;
 				ENABLE_USER_SCRIPT_SANDBOXING = YES;
@@ -826,7 +826,7 @@
 				CODE_SIGN_ENTITLEMENTS = Config/App.entitlements;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 26;
+				CURRENT_PROJECT_VERSION = 27;
 				DEVELOPMENT_TEAM = F3BE6NE7U3;
 				GENERATE_INFOPLIST_FILE = NO;
 				INFOPLIST_FILE = "Config/App-Info.plist";
@@ -851,7 +851,7 @@
 				CODE_SIGN_ENTITLEMENTS = Config/App.entitlements;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 26;
+				CURRENT_PROJECT_VERSION = 27;
 				DEVELOPMENT_TEAM = F3BE6NE7U3;
 				GENERATE_INFOPLIST_FILE = NO;
 				INFOPLIST_FILE = "Config/App-Info.plist";
@@ -875,7 +875,7 @@
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CODE_SIGN_ENTITLEMENTS = Config/Widget.entitlements;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 26;
+				CURRENT_PROJECT_VERSION = 27;
 				DEVELOPMENT_TEAM = F3BE6NE7U3;
 				GENERATE_INFOPLIST_FILE = NO;
 				INFOPLIST_FILE = "Config/Widget-Info.plist";
@@ -900,7 +900,7 @@
 				APPLICATION_EXTENSION_API_ONLY = YES;
 				CODE_SIGN_ENTITLEMENTS = Config/Widget.entitlements;
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 26;
+				CURRENT_PROJECT_VERSION = 27;
 				DEVELOPMENT_TEAM = F3BE6NE7U3;
 				GENERATE_INFOPLIST_FILE = NO;
 				INFOPLIST_FILE = "Config/Widget-Info.plist";

FuelBoard/ContentView.swift

@@ -161,7 +161,7 @@ struct ContentView: View {
     }
 
     private func installLocationUpdateHook() {
-        locationManager.onLocationUpdate = { [weak monitor] in
+        locationManager.onLocationUpdate = {
             self.updateAlertMonitor()
             // The Live Activity follows the same wake-ups — this hook
             // fires on every fix incl. background significant-change
@@ -401,28 +401,27 @@ struct ContentView: View {
     /// (computing a journey for each) and `savingsLookup` immediately scanned them
     /// all AGAIN to fill the per-station map. Both now share one result.
     ///
-    /// The baseline is chosen with EXACTLY the loop and guards of
-    /// `FuelSavingsEstimator.baselineStation`, so the row labelled "Closest
-    /// station" cannot move — and it is still selected when the feature is
-    /// unconfigured (it names that row), while the maps are only built when the
-    /// labels will actually be shown.
+    /// The baseline is chosen with the same journey and selected-fuel freshness
+    /// guards as `FuelSavingsEstimator.bestValueBaselineStation` when configured;
+    /// with the feature off, the ordinary Closest station still names that row.
     private func savingsScaffold() -> (baseline: FuelStation?, journeys: [String: FuelSavingsJourney]) {
         guard let location else { return (nil, [:]) }
-        let configured = fuelSavingsSettings.isConfigured
+        guard fuelSavingsSettings.isConfigured else {
+            let baseline = FuelSavingsEstimator.baselineStation(stations, fuel: selectedFuel) {
+                savingsJourneyMiles(for: $0, location: location)
+            }
+            return (baseline, [:])
+        }
         var journeys: [String: FuelSavingsJourney] = [:]
-        var bestStation: FuelStation?
-        var bestMiles = Double.infinity
         for station in stations where station.prices[selectedFuel] != nil {
-            guard let journey = savingsJourneyMiles(for: station, location: location) else { continue }
-            if configured { journeys[station.id] = journey }
-            let miles = journey.miles
-            guard miles.isFinite, miles >= 0 else { continue }
-            if miles < bestMiles {
-                bestMiles = miles
-                bestStation = station
+            if let journey = savingsJourneyMiles(for: station, location: location) {
+                journeys[station.id] = journey
             }
         }
-        return (bestStation, configured ? journeys : [:])
+        let baseline = FuelSavingsEstimator.bestValueBaselineStation(stations, fuel: selectedFuel) {
+            journeys[$0.id]
+        }
+        return (baseline, journeys)
     }
 
     /// Row/detail savings lookup with the comparison baseline and the per-station
@@ -455,15 +454,15 @@ struct ContentView: View {
         }
     }
 
-    /// The nearest station that sells the selected fuel — the Best Value
-    /// comparison baseline. It is chosen with the SAME journey values used by
-    /// the savings calculation, so a cached road route can change the baseline
-    /// and keep the "extra return travel" labels synchronized with the
-    /// cost calculation. When no road route is cached, the journey falls back to
-    /// straight-line out-and-back, and the result is marked as an estimate.
+    /// The Closest station with an eligible selected-fuel price — the Best Value
+    /// comparison baseline. Ordinary Closest sorting still includes stale stations.
+    /// It uses the same journey values as the savings calculation, so a cached
+    /// road route can change the baseline and keep the "extra return travel"
+    /// labels synchronized with the cost calculation. Without a cached route,
+    /// the journey falls back to straight-line and the result is an estimate.
     private var nearestSavingsBaseline: FuelStation? {
         guard let location else { return nil }
-        return FuelSavingsEstimator.baselineStation(
+        return FuelSavingsEstimator.bestValueBaselineStation(
             stations,
             fuel: selectedFuel,
             journeyMiles: { [self] station in savingsJourneyMiles(for: station, location: location) }
@@ -803,6 +802,10 @@ struct ContentView: View {
                         fuelSavings: savingsLookup(baseline: scaffold.baseline,
                                                    journeys: scaffold.journeys)(station),
                         fuelSavingsAmount: sessionFuelSavingsAmount,
+                        savingsPriceConfidence: FuelPriceFreshness.ComparisonConfidence.assess(
+                            station: station, fuel: selectedFuel, baseline: scaffold.baseline),
+                        savingsPriceWarning: FuelPriceFreshness.comparisonWarning(
+                            station: station, fuel: selectedFuel, baseline: scaffold.baseline),
                         savingsBaselineStationName: scaffold.baseline?.name,
                         journeyDiagnostics: journeyDiagnostics(for: station, baseline: scaffold.baseline),
                         isFavourite: favouriteIDs.contains(station.id),
@@ -1119,6 +1122,11 @@ struct ContentView: View {
             }
         }
         .onChange(of: fuelSavingsSettings) { old, new in
+            // An explicit Settings default edit supersedes the temporary slider
+            // override. Changes to MPG/enabled alone leave the session fill intact.
+            if old.preferredAmount != new.preferredAmount {
+                sessionFuelSavingsAmount = new.preferredAmount
+            }
             // Fuel Savings changed in Settings while the app was running: the
             // effective sort follows automatically (no stored sort is touched).
 #if DEBUG
@@ -1523,8 +1531,13 @@ struct ContentView: View {
             fuelSavingsSettings: fuelSavingsSettings,
             fuelSavingsAmount: $sessionFuelSavingsAmount,
             savingsForStation: savingsLookup(baseline: baselineStation, journeys: scaffold.journeys),
-            savingsBaselineStationName: baselineStation?.name,
             journeyDiagnosticsForStation: { station in journeyDiagnostics(for: station, baseline: baselineStation) },
+            savingsPriceConfidenceForStation: { station in
+                FuelPriceFreshness.ComparisonConfidence.assess(station: station, fuel: selectedFuel, baseline: baselineStation)
+            },
+            savingsPriceWarningForStation: { station in
+                FuelPriceFreshness.comparisonWarning(station: station, fuel: selectedFuel, baseline: baselineStation)
+            },
             onToggleFavourite: toggleFavourite,
             onRefresh: { await refresh(force: true) }
         )
@@ -1545,8 +1558,13 @@ struct ContentView: View {
             fuelSavingsSettings: fuelSavingsSettings,
             fuelSavingsAmount: $sessionFuelSavingsAmount,
             savingsForStation: savingsLookup(baseline: baselineStation, journeys: scaffold.journeys),
-            savingsBaselineStationName: baselineStation?.name,
             journeyDiagnosticsForStation: { station in journeyDiagnostics(for: station, baseline: baselineStation) },
+            savingsPriceConfidenceForStation: { station in
+                FuelPriceFreshness.ComparisonConfidence.assess(station: station, fuel: selectedFuel, baseline: baselineStation)
+            },
+            savingsPriceWarningForStation: { station in
+                FuelPriceFreshness.comparisonWarning(station: station, fuel: selectedFuel, baseline: baselineStation)
+            },
             onToggleFavourite: toggleFavourite,
             onReorder: reorderFavourites,
             onHistoryUnavailable: { if dataStatus == .live { dataStatus = .connectionProblem } },
@@ -1784,6 +1802,8 @@ struct StationRow: View {
     /// compact banner does not print it today, but a row that carried a hard
     /// zero would print "for £0" the moment it did — pass the real figure.
     var fuelSavingsAmount: FuelSavingsFillAmount = FuelSavingsSettings.defaultPreferredAmount
+    var savingsPriceConfidence: FuelPriceFreshness.ComparisonConfidence = .ineligible
+    var savingsPriceWarning: String? = nil
     var onToggleFavourite: () -> Void = {}
     var onShowDetails: (FuelStation) -> Void = { _ in }
 
@@ -1944,7 +1964,8 @@ struct StationRow: View {
                 FuelSavingsSummaryView(
                     availability: fuelSavings,
                     amount: fuelSavingsAmount,
-                    baselineStationName: nil,
+                    priceConfidence: savingsPriceConfidence,
+                    priceWarning: savingsPriceWarning,
                     compact: true,
                     distanceUnit: distanceUnit
                 )

FuelBoard/FavouritesView.swift

@@ -21,11 +21,12 @@ struct FavouritesView: View {
     /// still never touches the Settings default.
     let fuelSavingsSettings: FuelSavingsSettings
     @Binding var fuelSavingsAmount: FuelSavingsFillAmount
-    /// Estimated saving for a favourite, against the nearest eligible station —
-    /// the same baseline and definition the Stations list uses.
+    /// Estimated saving for a favourite, against the closest eligible station by
+    /// journey distance — the same baseline and definition the Stations list uses.
     var savingsForStation: (FuelStation) -> FuelSavingsAvailability? = { _ in nil }
-    var savingsBaselineStationName: String?
     var journeyDiagnosticsForStation: (FuelStation) -> FuelSavingsJourneyDiagnostics? = { _ in nil }
+    var savingsPriceConfidenceForStation: (FuelStation) -> FuelPriceFreshness.ComparisonConfidence
+    var savingsPriceWarningForStation: (FuelStation) -> String? = { _ in nil }
     var onToggleFavourite: (FuelStation, FuelType) -> Void = { _, _ in }
     /// Persists a reordered favourites array (after drag-and-drop).
     var onReorder: ([FavouriteEntry]) -> Void = { _ in }
@@ -84,8 +85,9 @@ struct FavouritesView: View {
          fuelSavingsSettings: FuelSavingsSettings = .defaults,
          fuelSavingsAmount: Binding<FuelSavingsFillAmount>,
          savingsForStation: @escaping (FuelStation) -> FuelSavingsAvailability? = { _ in nil },
-         savingsBaselineStationName: String? = nil,
          journeyDiagnosticsForStation: @escaping (FuelStation) -> FuelSavingsJourneyDiagnostics? = { _ in nil },
+         savingsPriceConfidenceForStation: @escaping (FuelStation) -> FuelPriceFreshness.ComparisonConfidence = { _ in .ineligible },
+         savingsPriceWarningForStation: @escaping (FuelStation) -> String? = { _ in nil },
          onToggleFavourite: @escaping (FuelStation, FuelType) -> Void = { _, _ in },
          onReorder: @escaping ([FavouriteEntry]) -> Void = { _ in },
          onHistoryUnavailable: (() -> Void)? = nil,
@@ -99,8 +101,9 @@ struct FavouritesView: View {
         self.fuelSavingsSettings = fuelSavingsSettings
         _fuelSavingsAmount = fuelSavingsAmount
         self.savingsForStation = savingsForStation
-        self.savingsBaselineStationName = savingsBaselineStationName
         self.journeyDiagnosticsForStation = journeyDiagnosticsForStation
+        self.savingsPriceConfidenceForStation = savingsPriceConfidenceForStation
+        self.savingsPriceWarningForStation = savingsPriceWarningForStation
         self.onToggleFavourite = onToggleFavourite
         self.onReorder = onReorder
         self.onHistoryUnavailable = onHistoryUnavailable
@@ -147,12 +150,9 @@ struct FavouritesView: View {
 
                     if fuelSavingsSettings.isConfigured {
                         Section {
-                            FuelSavingsAdjustmentView(
-                                amount: $fuelSavingsAmount,
-                                referencePricePencePerLitre: cheapestPrice
-                            )
+                            FuelSavingsAdjustmentView(amount: $fuelSavingsAmount)
                         } footer: {
-                            Text(String(localized: "Savings below are estimated against the nearest station with a price for this fuel — the same baseline as the Stations list.", comment: "Favourites fuel-savings explanation"))
+                            Text(String(localized: "Savings below are estimated against the closest eligible station by journey distance — the same baseline as the Stations list.", comment: "Favourites fuel-savings explanation"))
                         }
                     }
 
@@ -171,6 +171,8 @@ struct FavouritesView: View {
                                 tapAction: stationTapAction,
                                 fuelSavings: savingsForStation(station),
                                 fuelSavingsAmount: fuelSavingsAmount,
+                                savingsPriceConfidence: savingsPriceConfidenceForStation(station),
+                                savingsPriceWarning: savingsPriceWarningForStation(station),
                                 onToggleFavourite: { onToggleFavourite(station, activeFuel) },
                                 onShowDetails: { detailStation = $0 }
                             )
@@ -219,9 +221,11 @@ struct FavouritesView: View {
                     station: station,
                     location: location,
                     distanceUnit: distanceUnit,
+                    selectedFuel: activeFuel,
                     fuelSavings: savingsForStation(station),
                     fuelSavingsAmount: fuelSavingsAmount,
-                    savingsBaselineStationName: savingsBaselineStationName,
+                    savingsPriceConfidence: savingsPriceConfidenceForStation(station),
+                    savingsPriceWarning: savingsPriceWarningForStation(station),
                     journeyDiagnostics: journeyDiagnosticsForStation(station),
                     // Every station listed here IS a favourite for the tab's
                     // fuel, so the star starts filled; tapping it unstars.

FuelBoard/FuelBoardApp.swift

@@ -21,7 +21,7 @@ struct FuelBoardApp: App {
 
     var body: some Scene {
         WindowGroup {
-            ContentView()
+            rootView
                 .onOpenURL(perform: handleOpenURL)
                 .onReceive(NotificationCenter.default.publisher(for: .fuelBoardWatchRefreshRequested)) { _ in
                     WatchSyncManager.shared.pushSnapshot()
@@ -32,6 +32,24 @@ struct FuelBoardApp: App {
         }
     }
 
+    /// QA hook (Debug builds only): `-qaScreenMarker` paints the whole screen a
+    /// flat magenta. A macOS capture of the Simulator window can then locate the
+    /// device-screen rectangle exactly, which yields a pixel-accurate mapping
+    /// from simulator screenshots to click coordinates. That is the only way to
+    /// drive REAL taps into the Simulator: `simctl` cannot, and this project has
+    /// no UI-test target. Everything else renders ContentView as normal.
+    @ViewBuilder private var rootView: some View {
+        #if DEBUG
+        if ProcessInfo.processInfo.arguments.contains("-qaScreenMarker") {
+            Color(red: 1, green: 0, blue: 1).ignoresSafeArea()
+        } else {
+            ContentView()
+        }
+        #else
+        ContentView()
+        #endif
+    }
+
     #if DEBUG
     private func startQALiveActivity(fuel: FuelType) {
         let state = FuelBoardLiveActivityAttributes.ContentState(

FuelBoard/FuelSavingsViews.swift

@@ -2,7 +2,8 @@ import SwiftUI
 
 struct FuelSavingsAdjustmentView: View {
     @Binding var amount: FuelSavingsFillAmount
-    let referencePricePencePerLitre: Double?
+
+    @State private var unitChangeNotice: String?
 
     private var range: ClosedRange<Double> {
         FuelSavingsCalculator.fillAmountSliderRange(for: amount.unit)
@@ -44,6 +45,14 @@ struct FuelSavingsAdjustmentView: View {
             Text("Changes the estimate for this session only — your Settings default stays unchanged.")
                 .font(.caption2)
                 .foregroundStyle(.secondary)
+            Text("£ compares the litres your budget buys at each station; Litres compares one fixed quantity.")
+                .font(.caption2)
+                .foregroundStyle(.secondary)
+            if let unitChangeNotice {
+                Text(unitChangeNotice)
+                    .font(.caption2)
+                    .foregroundStyle(.orange)
+            }
         }
     }
 
@@ -52,12 +61,10 @@ struct FuelSavingsAdjustmentView: View {
             get: { amount.unit },
             set: { newUnit in
                 guard newUnit != amount.unit else { return }
-                if let referencePricePencePerLitre,
-                   let converted = try? FuelSavingsCalculator.convert(amount: amount, to: newUnit, referencePricePencePerLitre: referencePricePencePerLitre) {
-                    amount = converted
-                } else {
-                    amount = FuelSavingsFillAmount(value: newUnit == .pounds ? 40 : 30, unit: newUnit)
-                }
+                // No one litre figure equals a budget at every candidate price.
+                // A unit change starts a new, explicitly labelled comparison.
+                amount = FuelSavingsCalculator.newComparisonAmount(afterSwitching: amount, to: newUnit)
+                unitChangeNotice = "New comparison basis — adjust the \(newUnit.displayName) amount to your intended fill-up."
             }
         )
     }
@@ -73,11 +80,19 @@ struct FuelSavingsAdjustmentView: View {
 struct FuelSavingsSummaryView: View {
     let availability: FuelSavingsAvailability?
     let amount: FuelSavingsFillAmount
-    let baselineStationName: String?
+    /// Candidate/baseline price confidence for every Best Value result.
+    var priceConfidence: FuelPriceFreshness.ComparisonConfidence = .ineligible
+    var priceWarning: String? = nil
+    var baselineStationName: String? = nil
     var compact: Bool = false
     /// Sizes the "extra return travel" caption in the user's own unit (the
     /// stored figure is miles) — used by both the row banner and the detail sheet.
     var distanceUnit: DistanceUnit = .miles
+    var showInfoAction: (() -> Void)? = nil
+
+    private func comparisonLabel(for result: FuelSavingsResult) -> String {
+        FuelSavingsFormat.comparisonLabel(status: result.status)
+    }
 
     var body: some View {
         switch availability {
@@ -92,8 +107,25 @@ struct FuelSavingsSummaryView: View {
                 // break even, blue baseline. lineLimit + minimumScaleFactor keep
                 // it to one line, so rows stay even.
                 VStack(alignment: .leading, spacing: 2) {
+                    // The capsule gets the WHOLE line and the comparison caption
+                    // sits beneath it. Side by side, the caption's layoutPriority
+                    // squeezed the verdict until it truncated ("Approx. £2.75
+                    // better off after tra…"), and in this sort mode the verdict
+                    // is the point of the row.
                     capsule(for: result, compact: true)
                         .accessibilityLabel(accessibilityHeadline(for: result))
+                    Text(comparisonLabel(for: result))
+                        .font(.caption2)
+                        .foregroundStyle(.secondary)
+                        .lineLimit(1)
+                        .minimumScaleFactor(0.85)
+                        .accessibilityLabel("Comparison: \(comparisonLabel(for: result))")
+                    if let warning = priceWarning ?? priceConfidence.warningText {
+                        Text(warning)
+                            .font(.caption2)
+                            .foregroundStyle(.orange)
+                            .accessibilityLabel(warning)
+                    }
                     if let extraTravel = FuelSavingsFormat.extraTravelLabel(
                         extraDistanceMiles: result.extraDistanceMiles,
                         unit: distanceUnit,
@@ -117,11 +149,33 @@ struct FuelSavingsSummaryView: View {
                 // room for. The old shape led with a status word + headline that
                 // matched neither the listing nor each other.
                 VStack(alignment: .leading, spacing: 10) {
-                    capsule(for: result, compact: false)
-                        .accessibilityLabel(accessibilityHeadline(for: result))
+                    // Same shape as the listing rows: the capsule takes the line
+                    // and the comparison caption sits directly beneath it, so the
+                    // verdict never competes for width with its own caption.
+                    VStack(alignment: .leading, spacing: 4) {
+                        capsule(for: result, compact: false)
+                            .accessibilityLabel(accessibilityHeadline(for: result))
+                        Text(comparisonLabel(for: result))
+                            .font(.subheadline)
+                            .foregroundStyle(.secondary)
+                            .lineLimit(1)
+                            .minimumScaleFactor(0.85)
+                            .accessibilityLabel("Comparison: \(comparisonLabel(for: result))")
+                    }
                     LabeledContent("Your fill-up", value: amountText)
                     LabeledContent("Fuel you'll receive", value: String(format: "%.2f litres", result.fillLitres))
                         .monospacedDigit()
+                    if amount.unit == .pounds {
+                        Text("You pay the selected budget here. The saving compares the same litres at your closest eligible station; litres differ between stations, and this is not a refund.")
+                            .font(.caption2)
+                            .foregroundStyle(.secondary)
+                    }
+                    if let warning = priceWarning ?? priceConfidence.warningText {
+                        Text(warning)
+                            .font(.caption2)
+                            .foregroundStyle(.orange)
+                            .accessibilityLabel(warning)
+                    }
                     if let extraTravel = FuelSavingsFormat.extraTravelLabel(
                         extraDistanceMiles: result.extraDistanceMiles,
                         unit: distanceUnit,
@@ -133,11 +187,11 @@ struct FuelSavingsSummaryView: View {
                             .accessibilityLabel(spokenExtraTravel(for: result, fallback: extraTravel))
                     }
                     if result.status == .baseline {
-                        Text("Your closest station with a price for this fuel — every other saving is measured against it.")
+                        Text("Your closest eligible station by journey distance is the baseline — every other saving is measured against it.")
                             .font(.caption)
                             .foregroundStyle(.secondary)
                     } else {
-                        Text("Compared with \(baselineStationName ?? "your nearest station").")
+                        Text(baselineStationName.map { "Compared with \($0)." } ?? "Compared with your closest eligible station.")
                             .font(.caption)
                             .foregroundStyle(.secondary)
                         LabeledContent(
@@ -166,6 +220,22 @@ struct FuelSavingsSummaryView: View {
                             .font(.caption2)
                             .foregroundStyle(.secondary)
                     }
+                    if let showInfoAction {
+                        Rectangle()
+                            .fill(Color(.separator))
+                            .frame(height: 0.5)
+                            .padding(.vertical, 4)
+                        Button(action: showInfoAction) {
+                            HStack(spacing: 8) {
+                                Text("How Best Value works")
+                                Spacer(minLength: 8)
+                                Image(systemName: "chevron.forward")
+                                    .font(.footnote.weight(.semibold))
+                                    .foregroundStyle(.tertiary)
+                            }
+                        }
+                        .buttonStyle(.plain)
+                    }
                 }
             }
         case .unavailable(let reason):
@@ -196,7 +266,7 @@ struct FuelSavingsSummaryView: View {
     }
 
     /// VoiceOver form of the verdict. `spokenHeadline()` spells "Approx." out for
-    /// estimated comparisons and leaves the plain words ("Break even", "Closest
+    /// and leaves the plain words ("Break even", "Closest eligible
     /// station") alone — one source, so visible and spoken copy cannot drift.
     private func accessibilityHeadline(for result: FuelSavingsResult) -> String {
         result.spokenHeadline()
@@ -217,6 +287,9 @@ struct FuelSavingsSummaryView: View {
                 .accessibilityHidden(true)
             Text(result.capsuleHeadline())
                 .lineLimit(1)
+                // Belt and braces: now that the capsule owns its line it has no
+                // rival for width, and shrinking beats truncating at large
+                // Dynamic Type sizes.
                 .minimumScaleFactor(0.8)
         }
         .font(compact ? .caption.weight(.semibold) : .headline)

FuelBoard/HowBestValueSheet.swift

@@ -0,0 +1,71 @@
+import SwiftUI
+
+/// The "How Best Value works" explanation as its own sheet.
+///
+/// It used to sit inline in the Key sheet as a `Section`; it is one shared view
+/// now so the Key sheet and the More info sheet can both open it, and the copy is
+/// unchanged (the same `Localizable.strings` keys are reused — the old section
+/// header string is the sheet's title).
+struct HowBestValueSheet: View {
+    @Environment(\.dismiss) private var dismiss
+
+    var body: some View {
+        NavigationStack {
+            List {
+                Section {
+                    VStack(alignment: .leading, spacing: 10) {
+                        Text("Best Value compares each station with the closest eligible station by journey distance. It works out what you could save at the pump, then takes off the fuel used for the extra return journey.")
+                        Text("Your fill-up amount and MPG are used to show whether you could save overall.")
+                        Text("With a £ budget you spend that amount at each station; the litres differ by station. Savings compare those litres with the same quantity at your closest eligible station, then deduct extra journey fuel. You do not receive cash back.")
+                        Text("With Litres, every station is compared for the fixed quantity you selected.")
+                        Text("Results are marked “Approx.” until road distances are available.")
+                            .foregroundStyle(.secondary)
+                    }
+                    .font(.subheadline)
+                    .padding(.vertical, 4)
+                }
+            }
+            .navigationTitle("How Best Value works")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Done") { dismiss() }
+                }
+            }
+        }
+        .presentationDetents([.fraction(0.42)])
+        .presentationBackground(Color(UIColor.systemGroupedBackground))
+    }
+}
+
+/// The row that opens `HowBestValueSheet`. A tappable row with a chevron, like
+/// the other rows in both sheets. `.buttonStyle(.plain)` keeps it from becoming a
+/// row-wide tap target that could swallow a neighbouring control (see the
+/// two-buttons-in-one-row rule).
+struct HowBestValueRow: View {
+    let action: () -> Void
+
+    var body: some View {
+        Button(action: action) {
+            HStack(spacing: 8) {
+                Text("How Best Value works")
+                Spacer(minLength: 8)
+                Image(systemName: "chevron.forward")
+                    .font(.footnote.weight(.semibold))
+                    .foregroundStyle(.tertiary)
+            }
+        }
+        .buttonStyle(.plain)
+    }
+}
+
+#if DEBUG
+/// QA hook support: `-showBestValueInfo` opens this sheet without a tap, so it can
+/// be screenshotted (simctl has no tap command) — the same pattern as
+/// `-showKeySheet` / `-showDetail`.
+enum BestValueInfoQA {
+    static var isRequested: Bool {
+        ProcessInfo.processInfo.arguments.contains("-showBestValueInfo")
+    }
+}
+#endif

FuelBoard/LiveActivityManager.swift

@@ -79,7 +79,7 @@ enum LiveActivityManager {
                 currentStartDate = nil
                 start(attributes: attributes, state: state)
             } else {
-                Task { await current.update(using: state) }
+                Task { await current.update(ActivityContent(state: state, staleDate: nil)) }
             }
         } else {
             start(attributes: attributes, state: state)

FuelBoard/OnboardingView.swift

@@ -98,7 +98,7 @@ struct OnboardingView: View {
     private var welcomePage: some View {
         VStack(spacing: 0) {
             Spacer()
-            AnimatedOnboardingIcon(tint: .accentColor) {
+            AnimatedOnboardingIcon(tint: .accentColor, showsHalo: false) {
                 // The app icon itself, with the standard iOS rounded-corner
                 // treatment (~22% of the size), so onboarding matches the
                 // Home Screen.
@@ -108,9 +108,9 @@ struct OnboardingView: View {
                     .frame(width: 96, height: 96)
                     .clipShape(RoundedRectangle(cornerRadius: 21, style: .continuous))
             }
-            .padding(.bottom, 28)
+            .padding(.bottom, 16)
 
-            Text(String(localized: "Welcome to FuelBoard", comment: "Onboarding welcome title"))
+            Text(String(localized: "Welcome to\nFuelBoard", comment: "Onboarding welcome title"))
                 .font(.largeTitle.bold())
                 .multilineTextAlignment(.center)
 
@@ -121,12 +121,13 @@ struct OnboardingView: View {
                 .padding(.horizontal, 32)
                 .padding(.top, 12)
 
-            featureRow(icon: "globe.europe.africa.fill", text: String(localized: "UK-wide prices — 8,000+ stations, updated twice a day", comment: "Onboarding feature row"))
-            featureRow(icon: "scope", text: String(localized: "Cheapest within your chosen radius, or closest station first", comment: "Onboarding feature row"))
-            featureRow(icon: "star.fill", text: String(localized: "Favourites with instant price comparison", comment: "Onboarding feature row"))
-            featureRow(icon: "chart.bar.fill", text: String(localized: "Green/amber/red rating vs the best nearby price", comment: "Onboarding feature row"))
-            featureRow(icon: "square.grid.2x2.fill", text: String(localized: "Home-screen widget showing the cheapest nearby", comment: "Onboarding feature row"))
-            featureRow(icon: "bell.fill", text: String(localized: "Alerts when you approach the cheapest station", comment: "Onboarding feature row"))
+            featureRow(icon: "map.fill", title: String(localized: "Compare fuel prices near you", comment: "Onboarding feature row title"), subtitle: String(localized: "Over 8,000 stations across Great Britain, with prices updated daily.", comment: "Onboarding feature row subtitle"))
+            
+            featureRow(icon: "chart.line.uptrend.xyaxis", title: String(localized: "See how much you could save", comment: "Onboarding feature row title"), subtitle: String(localized: "Compare fill-up costs and potential savings at different stations.", comment: "Onboarding feature row subtitle"))
+            
+            featureRow(icon: "car.fill", title: String(localized: "Know if it's worth the drive", comment: "Onboarding feature row title"), subtitle: String(localized: "Factor in your journey and fuel costs to find the best value.", comment: "Onboarding feature row subtitle"))
+            
+            featureRow(icon: "star.fill", title: String(localized: "Keep your favourites close", comment: "Onboarding feature row title"), subtitle: String(localized: "Save stations and quickly compare their latest prices.", comment: "Onboarding feature row subtitle"))
 
             Spacer()
         }
@@ -155,7 +156,7 @@ struct OnboardingView: View {
             permissionStatusLabel(
                 granted: prompter.locationGranted,
                 denied: prompter.locationDenied,
-                deniedText: String(localized: "Location was denied. You can still browse all stations, but \"nearest\" sorting needs it.", comment: "Onboarding location denied text")
+                deniedText: String(localized: "Location was denied. You can still browse all stations, but \"closest\" sorting needs it.", comment: "Onboarding location denied text")
             )
             .padding(.top, 24)
 
@@ -298,18 +299,23 @@ struct OnboardingView: View {
         OnboardingPrimaryButton(title: title, action: action)
     }
 
-    private func featureRow(icon: String, text: String) -> some View {
-        HStack(spacing: 12) {
+    private func featureRow(icon: String, title: String, subtitle: String) -> some View {
+        HStack(alignment: .top, spacing: 12) {
             Image(systemName: icon)
                 .font(.system(size: 20, weight: .semibold))
                 .foregroundStyle(Color.accentColor)
                 .frame(width: 32)
-            Text(text)
-                .font(.subheadline)
+            VStack(alignment: .leading, spacing: 2) {
+                Text(title)
+                    .font(.subheadline.bold())
+                Text(subtitle)
+                    .font(.subheadline)
+                    .foregroundStyle(.secondary)
+            }
             Spacer(minLength: 0)
         }
         .padding(.horizontal, 36)
-        .padding(.vertical, 10)
+        .padding(.vertical, 8)
     }
 
     private func permissionStatusLabel(granted: Bool, denied: Bool, deniedText: String) -> some View {
@@ -393,6 +399,9 @@ struct AnimatedOnboardingIcon<Content: View>: View {
 
     let tint: Color
     var motion: Motion = .gentle
+    /// The soft circle behind the glyph. The welcome page turns it off: it shows
+    /// the app icon itself and reads better with no container around it.
+    var showsHalo: Bool = true
     @ViewBuilder var content: Content
 
     @State private var settled = false
@@ -402,16 +411,18 @@ struct AnimatedOnboardingIcon<Content: View>: View {
 
     var body: some View {
         ZStack {
-            Circle()
-                .fill(tint.opacity(0.10))
-                .frame(width: 108, height: 108)
-                .scaleEffect(settled ? 1.0 : 0.94)
+            if showsHalo {
+                Circle()
+                    .fill(tint.opacity(0.10))
+                    .frame(width: 108, height: 108)
+                    .scaleEffect(settled ? 1.0 : 0.94)
 
-            Circle()
-                .stroke(tint.opacity(0.18), lineWidth: 1)
-                .frame(width: 118, height: 118)
-                .scaleEffect(settled ? 1.03 : 0.97)
-                .opacity(settled ? 1.0 : 0.55)
+                Circle()
+                    .stroke(tint.opacity(0.18), lineWidth: 1)
+                    .frame(width: 118, height: 118)
+                    .scaleEffect(settled ? 1.03 : 0.97)
+                    .opacity(settled ? 1.0 : 0.55)
+            }
 
             content
                 .scaleEffect(iconScale)

FuelBoard/RoadDistanceService.swift

@@ -13,6 +13,7 @@
 // every row at once; the mode must also be ON for any pass to run at all.
 
 import Foundation
+import CoreLocation
 import MapKit
 import UIKit
 import WidgetKit
@@ -407,8 +408,14 @@ enum RoadDistanceService {
     /// Driving distance (metres) between two coordinates via Apple Maps routing.
     private static func roadMeters(from: CLLocationCoordinate2D, to: CLLocationCoordinate2D) async -> Double? {
         let request = MKDirections.Request()
-        request.source = MKMapItem(placemark: MKPlacemark(coordinate: from))
-        request.destination = MKMapItem(placemark: MKPlacemark(coordinate: to))
+        request.source = MKMapItem(
+            location: CLLocation(latitude: from.latitude, longitude: from.longitude),
+            address: nil
+        )
+        request.destination = MKMapItem(
+            location: CLLocation(latitude: to.latitude, longitude: to.longitude),
+            address: nil
+        )
         request.transportType = .automobile
         request.requestsAlternateRoutes = false
         do {

FuelBoard/SettingsView.swift

@@ -79,6 +79,7 @@ struct SettingsView: View {
     /// Return key, so the keyboard's Done button clears this to dismiss AND
     /// commit the typed value. Both Fuel Savings controls are sliders now, so
     /// nothing sets it — it stays for any numeric field this screen takes again.
+    @State private var settingsUnitChangeNotice: String?
     @FocusState private var focusedSavingsField: SavingsField?
 
     private enum SavingsField: Hashable {
@@ -148,6 +149,11 @@ struct SettingsView: View {
                                step: FuelSavingsCalculator.fillAmountSliderStep(for: fuelSavingsSettings.preferredAmount.unit))
                             .accessibilityLabel("Typical fill-up")
                             .accessibilityValue(fillUpText)
+                        if let settingsUnitChangeNotice {
+                            Text(settingsUnitChangeNotice)
+                                .font(.caption2)
+                                .foregroundStyle(.orange)
+                        }
                         if !fuelSavingsSettings.isConfigured && fuelSavingsSettings.enabled {
                             Text("Set a realistic UK MPG and fill-up amount before Best Value appears in sorting.")
                                 .font(.caption)
@@ -285,7 +291,7 @@ struct SettingsView: View {
                     } header: {
                         Text("Debug")
                     } footer: {
-                        Text("The first button applies the real criteria — cheapest \(alertsFuel.displayName.lowercased()) station within \(distanceUnit.format(alertsRadiusKM)) of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (nearest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions. Cheapest in range mirrors the app list (selected fuel + distance); the in-range count mirrors the alert radius.")
+                        Text("The first button applies the real criteria — cheapest \(alertsFuel.displayName.lowercased()) station within \(distanceUnit.format(alertsRadiusKM)) of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (closest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions. Cheapest in range mirrors the app list (selected fuel + distance); the in-range count mirrors the alert radius.")
                     }
                     .onAppear { onRefreshDebugStatus() }
 
@@ -709,10 +715,10 @@ struct SettingsView: View {
         Binding(
             get: { fuelSavingsSettings.preferredAmount.unit },
             set: { newUnit in
-                fuelSavingsSettings.preferredAmount.unit = newUnit
-                if !fuelSavingsSettings.preferredAmount.isValid {
-                    fuelSavingsSettings.preferredAmount.value = newUnit == .pounds ? 40 : 30
-                }
+                guard newUnit != fuelSavingsSettings.preferredAmount.unit else { return }
+                fuelSavingsSettings.preferredAmount = FuelSavingsCalculator.newComparisonAmount(
+                    afterSwitching: fuelSavingsSettings.preferredAmount, to: newUnit)
+                settingsUnitChangeNotice = "New comparison basis — adjust the \(newUnit.displayName) amount to your intended fill-up."
                 persistFuelSavingsSettings()
             }
         )

FuelBoard/StationDetailView.swift

@@ -17,8 +17,12 @@ struct StationDetailView: View {
     let station: FuelStation
     let location: Coordinate?
     let distanceUnit: DistanceUnit
+    /// Fuel whose price is being shown by the surrounding station list.
+    var selectedFuel: FuelType = FuelStore.loadSelectedFuel()
     var fuelSavings: FuelSavingsAvailability? = nil
     var fuelSavingsAmount: FuelSavingsFillAmount = FuelSavingsSettings.defaultPreferredAmount
+    var savingsPriceConfidence: FuelPriceFreshness.ComparisonConfidence = .ineligible
+    var savingsPriceWarning: String? = nil
     var savingsBaselineStationName: String? = nil
     var journeyDiagnostics: FuelSavingsJourneyDiagnostics? = nil
     /// Whether this station is starred for the fuel currently being viewed, and
@@ -29,6 +33,13 @@ struct StationDetailView: View {
     var onToggleFavourite: (() -> Void)? = nil
     @Environment(\.dismiss) private var dismiss
     @State private var showingReportIssueConfirmation = false
+    /// Transient "Postcode copied" confirmation on the Address row. Cleared by a task so
+    /// the caption fades out on its own.
+    @State private var showingCopied = false
+    @State private var copyResetTask: Task<Void, Never>?
+    /// The "How Best Value works" sheet, opened from the row at the bottom of the
+    /// Best Value card (the Key sheet opens the same shared view).
+    @State private var showBestValueInfo = false
 
     private let reportIssueURL = URL(string: "https://www.gov.uk/guidance/report-an-error-in-fuel-prices-or-forecourt-details")!
 
@@ -36,10 +47,73 @@ struct StationDetailView: View {
         CLLocationCoordinate2D(latitude: station.lat, longitude: station.lng)
     }
 
+    /// The row's address text — the same shared line the listing row uses, with
+    /// any leading repeat of the station name stripped.
+    private var addressLine: String {
+        StationAddressLine.display(address: station.address,
+                                   postcode: station.postcode,
+                                   name: station.name)
+    }
+
+    /// The station's postcode, trimmed. Empty means there is nothing to copy and
+    /// the Address row stays inert.
+    private var postcodeForCopying: String {
+        station.postcode.trimmingCharacters(in: .whitespacesAndNewlines)
+    }
+
+    private var priceFreshness: FuelPriceFreshness.Assessment {
+        FuelPriceFreshness.assessment(for: station, fuel: selectedFuel)
+    }
+
+    /// The selected grade's current price, when present. Kept separate from
+    /// the freshness label so a stale price remains visible rather than being
+    /// silently hidden.
+    private var selectedFuelPriceText: String {
+        guard let price = station.prices[selectedFuel] else { return "—" }
+        return FuelStore.priceText(price, style: .stationSign)
+    }
+
+    /// Opens Apple Maps driving directions — the same destination (and the same
+    /// URL) the Directions button below uses, so the map and the button can
+    /// never point at two different places.
+    private func openDirections() {
+        if let url = station.mapsDirectionsURL {
+            UIApplication.shared.open(url)
+        }
+    }
+
+    /// Copies ONLY the postcode, so it can be pasted into another navigation app
+    /// without dragging the station name and street along with it. Confirms with
+    /// a light haptic and a caption that fades after ~2s.
+    private func copyPostcode() {
+        let postcode = postcodeForCopying
+        guard !postcode.isEmpty else { return }
+        UIPasteboard.general.string = postcode
+        UINotificationFeedbackGenerator().notificationOccurred(.success)
+        withAnimation(.easeInOut(duration: 0.2)) { showingCopied = true }
+        copyResetTask?.cancel()
+        copyResetTask = Task {
+            try? await Task.sleep(nanoseconds: 2_000_000_000)
+            guard !Task.isCancelled else { return }
+            withAnimation(.easeInOut(duration: 0.3)) { showingCopied = false }
+        }
+    }
+
     var body: some View {
         NavigationStack {
             List {
                 Section {
+                    // Tapping anywhere on the map opens the same Apple Maps
+                    // directions the Directions button below opens.
+                    //
+                    // The tap target is an OVERLAY Button laid ON TOP of the
+                    // Map, not a Button wrapping it. A Map runs its own UIKit
+                    // view, and inside a List row the wrapped-Map form left the
+                    // card untappable — the touch never reached the button. An
+                    // overlay sits above the map, owns an explicit rounded-rect
+                    // content shape, and cannot be intercepted by MapKit. The
+                    // Map itself stays non-interactive: it is a preview, not
+                    // something to pan.
                     Map(position: .constant(.region(MKCoordinateRegion(
                         center: stationCoordinate,
                         span: MKCoordinateSpan(latitudeDelta: 0.02, longitudeDelta: 0.02)
@@ -50,16 +124,88 @@ struct StationDetailView: View {
                     .frame(height: 180)
                     .clipShape(RoundedRectangle(cornerRadius: 12))
                     .allowsHitTesting(false)
-                    .listRowInsets(EdgeInsets())
-                }
-                Section {
-                    // The station name is NOT repeated here: the sheet header
-                    // (navigationTitle, inline) already shows it, and the address
-                    // line below has any leading repeat of the name stripped, so
-                    // a "Name" row only said it twice.
-                    LabeledContent("Address", value: StationAddressLine.display(address: station.address,
-                                                                             postcode: station.postcode,
-                                                                             name: station.name))
+                    .overlay {
+                        Button {
+                            openDirections()
+                        } label: {
+                            Color.clear
+                                .contentShape(RoundedRectangle(cornerRadius: 12))
+                        }
+                        .buttonStyle(.plain)
+                        .accessibilityLabel(String(localized: "Directions to \(station.name)",
+                                                   comment: "Accessibility label for the tappable map preview in the More info sheet"))
+                        .accessibilityHint(String(localized: "Opens Apple Maps with driving directions",
+                                                  comment: "Accessibility hint for the tappable map preview in the More info sheet"))
+                    }
+                    // No hairline between the map and the Address row: the map
+                    // already reads as its own block, so the line only added
+                    // clutter. The Address/Distance and Distance/actions lines
+                    // stay.
+                    .listRowSeparator(.hidden, edges: .bottom)
+                    // The map, the address, the distance, any notices and the two
+                    // station actions all share ONE card (the list's own row
+                    // hairlines separate them), so no hand-rolled Divider here —
+                    // adding one would double the line.
+                    //
+                    // The station name is NOT repeated: the sheet header already
+                    // shows it.
+                    //
+                    // The whole row is a copy control: it puts JUST the postcode
+                    // on the clipboard so it can be pasted into another
+                    // navigation app. The copy glyph sits ON the address line,
+                    // and the "Postcode copied" confirmation is a capsule that floats OVER
+                    // THIS ROW — it confirms the address, so it must not hover
+                    // over the map. It is an overlay, so nothing moves while it is
+                    // up, and `allowsHitTesting(false)` keeps the row tappable
+                    // through the capsule.
+                    Button {
+                        copyPostcode()
+                    } label: {
+                        HStack(alignment: .firstTextBaseline, spacing: 8) {
+                            Text("Address")
+                            Spacer(minLength: 8)
+                            Text(addressLine)
+                                .multilineTextAlignment(.trailing)
+                                .foregroundStyle(.secondary)
+                            // Stays the plain copy glyph — the capsule carries
+                            // the confirmation, so swapping this to a checkmark
+                            // would say it twice.
+                            Image(systemName: "doc.on.doc")
+                                .font(.footnote.weight(.semibold))
+                                .foregroundStyle(.secondary)
+                        }
+                    }
+                    .buttonStyle(.plain)
+                    .disabled(postcodeForCopying.isEmpty)
+                    .accessibilityLabel(String(localized: "Address: \(addressLine)",
+                                               comment: "Accessibility label for the address row in the More info sheet"))
+                    .accessibilityHint(postcodeForCopying.isEmpty
+                        ? ""
+                        : String(localized: "Copies the postcode",
+                                 comment: "Accessibility hint for the address row in the More info sheet"))
+                    // Horizontally centred over the address line itself.
+                    .overlay(alignment: .center) {
+                        if showingCopied {
+                            HStack(spacing: 4) {
+                                Image(systemName: "checkmark")
+                                Text("Postcode copied")
+                            }
+                            .font(.footnote.weight(.semibold))
+                            .foregroundStyle(.green)
+                            .padding(.horizontal, 10)
+                            .padding(.vertical, 6)
+                            // A material base keeps it legible where the tint
+                            // alone (the notice-capsule recipe) washes out.
+                            .background {
+                                Capsule()
+                                    .fill(.regularMaterial)
+                                    .overlay(Capsule().fill(Color.green.opacity(0.22)))
+                            }
+                            .allowsHitTesting(false)
+                            .accessibilityHidden(true)
+                            .transition(.opacity)
+                        }
+                    }
                     if let location {
                         let distance = FuelStore.stationDistanceDisplay(
                             station: station, userLat: location.lat, userLng: location.lng
@@ -67,6 +213,10 @@ struct StationDetailView: View {
                         LabeledContent("Distance", value: distance.labelWithReturn(unit: distanceUnit))
                             .monospacedDigit()
                     }
+                    LabeledContent("\(selectedFuel.displayName) price", value: selectedFuelPriceText)
+                        .monospacedDigit()
+                    LabeledContent("Price updated", value: priceFreshness.updateAgeLabel)
+                        .monospacedDigit()
                     ForEach(StationNotice.notices(for: station)) { notice in
                         Label(notice.title, systemImage: notice.symbolName)
                             .font(.subheadline.weight(.semibold))
@@ -75,6 +225,28 @@ struct StationDetailView: View {
                             .padding(.vertical, 6)
                             .background(Capsule().fill(Color.orange.opacity(0.14)))
                     }
+                    // The two station actions are the LAST row of the card: half
+                    // the width each, on one line, below Address and Distance.
+                    HStack(spacing: 12) {
+                        Button {
+                            openDirections()
+                        } label: {
+                            Label("Directions", systemImage: "arrow.triangle.turn.up.right.diamond.fill")
+                                .frame(maxWidth: .infinity)
+                        }
+                        Button(role: .destructive) {
+                            showingReportIssueConfirmation = true
+                        } label: {
+                            Label("Report issue", systemImage: "exclamationmark.bubble.fill")
+                                .frame(maxWidth: .infinity)
+                        }
+                    }
+                    // REQUIRED: with the default button style a `List` row has ONE
+                    // row-wide tap target, so two buttons in the same row BOTH fire
+                    // on any tap inside the row (tapping Directions also showed the
+                    // report-issue alert and vice versa). `.borderless` gives each
+                    // button its own hit area — the half-row frame above.
+                    .buttonStyle(.borderless)
                 }
                 // Only shown while Fuel Savings backs it. `fuelSavings` is nil
                 // when the feature is off — `savingsLookup` returns nil when it
@@ -85,8 +257,11 @@ struct StationDetailView: View {
                         FuelSavingsSummaryView(
                             availability: fuelSavings,
                             amount: fuelSavingsAmount,
+                            priceConfidence: savingsPriceConfidence,
+                            priceWarning: savingsPriceWarning,
                             baselineStationName: savingsBaselineStationName,
-                            distanceUnit: distanceUnit
+                            distanceUnit: distanceUnit,
+                            showInfoAction: { showBestValueInfo = true }
                         )
                     } header: {
                         Text("Best Value")
@@ -105,20 +280,6 @@ struct StationDetailView: View {
                 }
 #endif
 
-                Section {
-                    Button {
-                        if let url = station.mapsDirectionsURL {
-                            UIApplication.shared.open(url)
-                        }
-                    } label: {
-                        Label("Directions", systemImage: "arrow.triangle.turn.up.right.diamond.fill")
-                    }
-                    Button(role: .destructive) {
-                        showingReportIssueConfirmation = true
-                    } label: {
-                        Label("Report issue", systemImage: "exclamationmark.bubble.fill")
-                    }
-                }
             }
             .navigationTitle(station.name)
             .navigationBarTitleDisplayMode(.inline)
@@ -130,6 +291,8 @@ struct StationDetailView: View {
             } message: {
                 Text("Are you sure you want to report an error in fuel prices or forecourt details? This will open in your chosen browser.")
             }
+            // Nested sheet: the More info sheet stays put behind the explanation.
+            .sheet(isPresented: $showBestValueInfo) { HowBestValueSheet() }
             .toolbar {
                 ToolbarItem(placement: .cancellationAction) {
                     Button("Done") { dismiss() }
@@ -149,6 +312,18 @@ struct StationDetailView: View {
                     )
                 }
             }
+            // The "Postcode copied" fade-out task must not outlive the sheet.
+            .onDisappear { copyResetTask?.cancel() }
+#if DEBUG
+            // QA hook: `-qaCopyPostcode` runs the REAL copy on open, so the
+            // clipboard value (read back with `xcrun simctl pbpaste`) and the
+            // "Postcode copied" confirmation can be verified without a tap — simctl
+            // cannot drive taps into the Simulator.
+            .task {
+                guard ProcessInfo.processInfo.arguments.contains("-qaCopyPostcode") else { return }
+                copyPostcode()
+            }
+#endif
         }
     }
 }

FuelBoard/StationsView.swift

@@ -19,8 +19,9 @@ struct StationsView: View {
     let fuelSavingsSettings: FuelSavingsSettings
     @Binding var fuelSavingsAmount: FuelSavingsFillAmount
     var savingsForStation: (FuelStation) -> FuelSavingsAvailability? = { _ in nil }
-    var savingsBaselineStationName: String?
     var journeyDiagnosticsForStation: (FuelStation) -> FuelSavingsJourneyDiagnostics? = { _ in nil }
+    var savingsPriceConfidenceForStation: (FuelStation) -> FuelPriceFreshness.ComparisonConfidence
+    var savingsPriceWarningForStation: (FuelStation) -> String?
     var onToggleFavourite: (FuelStation, FuelType) -> Void = { _, _ in }
     var onRefresh: () async -> Void = {}
 
@@ -35,6 +36,11 @@ struct StationsView: View {
     /// info button in the header — keeps the list focused on stations.
     @State private var showKey = false
 
+    /// The "How Best Value works" sheet. The explanation used to be a section in
+    /// the Key sheet; it is its own sheet now, opened from a row at the bottom of
+    /// the Key sheet and from the More info sheet.
+    @State private var showBestValueInfo = false
+
     /// Station picked for the More-info sheet (tap action = showDetails).
     @State private var detailStation: FuelStation?
 
@@ -63,7 +69,7 @@ struct StationsView: View {
         }
         if location != nil {
             if sortMode == .closest {
-                return "\(mode) \(fuel) stations — nearest first, best value within \(miles) \(unit) · \(ratio) stations updated"
+                return "\(mode) \(fuel) stations — closest first, lowest price within \(miles) \(unit) · \(ratio) stations updated"
             }
             return "\(mode) \(fuel) within \(miles) \(unit) — \(ratio) stations updated · \(tapHint)"
         }
@@ -89,7 +95,7 @@ struct StationsView: View {
                     }
                     .pickerStyle(.segmented)
                     // In Closest mode the whole country is the pool — the
-                    // radius is meaningless ("nearest" must never return an
+                    // radius is meaningless ("closest" must never return an
                     // empty state), so the picker is disabled but its value is
                     // kept for when the user switches back to Cheapest.
                     .disabled(sortMode == .closest)
@@ -116,10 +122,12 @@ struct StationsView: View {
                     // stale stored sort mode must not keep the control on screen
                     // for a switched-off feature.
                     if sortMode == .worthTheDrive && fuelSavingsSettings.isConfigured {
-                        FuelSavingsAdjustmentView(
-                            amount: $fuelSavingsAmount,
-                            referencePricePencePerLitre: baselinePrice
-                        )
+                        FuelSavingsAdjustmentView(amount: $fuelSavingsAmount)
+                        if !stations.isEmpty && stations.allSatisfy({ savingsPriceConfidenceForStation($0) == .ineligible }) {
+                            Text("Best Value unavailable: no eligible price comparison. Stations and prices remain visible below.")
+                                .font(.caption)
+                                .foregroundStyle(.orange)
+                        }
                     }
 
                     if isLoading && stations.isEmpty {
@@ -144,22 +152,7 @@ struct StationsView: View {
                         .padding(.vertical, 4)
                     } else {
                         ForEach(Array(stations.prefix(visibleCount)), id: \.id) { station in
-                            StationRow(
-                                station: station,
-                                fuel: selectedFuel,
-                                location: location,
-                                distanceUnit: distanceUnit,
-                                priceDisplayStyle: priceDisplayStyle,
-                                baselinePrice: baselinePrice,
-                                isTopResult: station.id == topStationID,
-                                isFavourite: favouriteIDs.contains(station.id),
-                                topBadgeText: sortMode == .worthTheDrive ? "CHEAPEST" : "TOP",
-                                tapAction: stationTapAction,
-                                fuelSavings: savingsForStation(station),
-                                fuelSavingsAmount: fuelSavingsAmount,
-                                onToggleFavourite: { onToggleFavourite(station, selectedFuel) },
-                                onShowDetails: { detailStation = $0 }
-                            )
+                            stationRow(station)
                         }
 
                         if visibleCount < stations.count {
@@ -218,6 +211,18 @@ struct StationsView: View {
                 if ProcessInfo.processInfo.arguments.contains("-showKeySheet") {
                     showKey = true
                 }
+                // QA hook: `-showBestValueInfo` opens the Key sheet and then the
+                // explanation on top of it, so the copy can be screenshotted
+                // without a tap. It has to chain: the explanation's `.sheet` lives
+                // inside the Key sheet's content, so it cannot present while the
+                // Key sheet is shut.
+                if BestValueInfoQA.isRequested {
+                    showKey = true
+                    Task { @MainActor in
+                        try? await Task.sleep(nanoseconds: 1_200_000_000)
+                        showBestValueInfo = true
+                    }
+                }
 #endif
             }
             .task(id: stations.count) {
@@ -243,6 +248,31 @@ struct StationsView: View {
                 }
             }
             .sheet(isPresented: $showKey) {
+                keySheet
+            }
+            .sheet(item: $detailStation) { station in
+                detailSheet(for: station)
+            }
+        }
+    }
+
+    private func detailSheet(for station: FuelStation) -> some View {
+        StationDetailView(
+            station: station,
+            location: location,
+            distanceUnit: distanceUnit,
+            selectedFuel: selectedFuel,
+            fuelSavings: savingsForStation(station),
+            fuelSavingsAmount: fuelSavingsAmount,
+            savingsPriceConfidence: savingsPriceConfidenceForStation(station),
+            savingsPriceWarning: savingsPriceWarningForStation(station),
+            journeyDiagnostics: journeyDiagnosticsForStation(station),
+            isFavourite: favouriteIDs.contains(station.id),
+            onToggleFavourite: { onToggleFavourite(station, selectedFuel) }
+        )
+    }
+
+    private var keySheet: some View {
                 NavigationStack {
                     List {
                         Section {
@@ -250,14 +280,14 @@ struct StationsView: View {
                                 keyCard(
                                     icon: "checkmark.circle.fill", color: .green,
                                     title: "Good price", blurb: "Within 1.5p of the cheapest",
-                                    threshold: "≤1.5p")
+                                    threshold: "0–1.5p")
                                 keyCard(
                                     icon: "equal.circle.fill", color: .orange,
-                                    title: "Okay", blurb: "Within 4p of the cheapest",
-                                    threshold: "≤4p")
+                                    title: "Okay", blurb: "More than 1.5p, up to 4p above the cheapest",
+                                    threshold: ">1.5–4p")
                                 keyCard(
                                     icon: "exclamationmark.circle.fill", color: .red,
-                                    title: "Pricey", blurb: "More than 4p over the cheapest",
+                                    title: "Pricey", blurb: "More than 4p above the cheapest",
                                     threshold: ">4p")
                                 Rectangle()
                                     .fill(Color(.separator))
@@ -289,25 +319,26 @@ struct StationsView: View {
                                 .padding(.horizontal, 14)
                                 .padding(.vertical, 12)
                                 .keyCardFill(color: .yellow)
-                                Text("Colours match each station's rating on the list")
+                                Text("Price differences are shown in pence per litre (p/litre). Colours match each station's rating on the list.")
                                     .font(.footnote)
                                     .foregroundStyle(.secondary)
-                                    .frame(maxWidth: .infinity)
+                                    .frame(maxWidth: .infinity, alignment: .center)
+                                    .multilineTextAlignment(.center)
                                     .padding(.top, 4)
                             }
                             .listRowBackground(Color.clear)
                             .listRowInsets(EdgeInsets(top: 4, leading: 16, bottom: 4, trailing: 16))
                         }
 
-                        Section("How Best Value works") {
-                            VStack(alignment: .leading, spacing: 10) {
-                                Text("Best Value compares each station with the closest one. It works out what you could save at the pump, then takes off the fuel used for the extra return journey.")
-                                Text("Your fill-up amount and MPG are used to show whether you could save overall.")
-                                Text("Results are marked “Approx.” until road distances are available.")
-                                    .foregroundStyle(.secondary)
+                        // The explanation is its own sheet now, opened from this
+                        // row. Gated exactly like the More info row and the Best
+                        // Value card itself: `isConfigured` is the same condition
+                        // `savingsForStation` uses, so the row appears and
+                        // disappears with the feature.
+                        if fuelSavingsSettings.isConfigured {
+                            Section {
+                                HowBestValueRow { showBestValueInfo = true }
                             }
-                            .font(.subheadline)
-                            .padding(.vertical, 4)
                         }
                     }
                     .navigationTitle("Key")
@@ -317,24 +348,32 @@ struct StationsView: View {
                             Button("Done") { showKey = false }
                         }
                     }
+                    // Nested sheet: the Key sheet stays behind the explanation.
+                    .sheet(isPresented: $showBestValueInfo) { HowBestValueSheet() }
                 }
                 .presentationDetents([.fraction(0.6)])
                 .presentationBackground(Color(UIColor.systemGroupedBackground))
-            }
-            .sheet(item: $detailStation) { station in
-                StationDetailView(
-                    station: station,
-                    location: location,
-                    distanceUnit: distanceUnit,
-                    fuelSavings: savingsForStation(station),
-                    fuelSavingsAmount: fuelSavingsAmount,
-                    savingsBaselineStationName: savingsBaselineStationName,
-                    journeyDiagnostics: journeyDiagnosticsForStation(station),
-                    isFavourite: favouriteIDs.contains(station.id),
-                    onToggleFavourite: { onToggleFavourite(station, selectedFuel) }
-                )
-            }
-        }
+    }
+
+    private func stationRow(_ station: FuelStation) -> some View {
+        StationRow(
+            station: station,
+            fuel: selectedFuel,
+            location: location,
+            distanceUnit: distanceUnit,
+            priceDisplayStyle: priceDisplayStyle,
+            baselinePrice: baselinePrice,
+            isTopResult: station.id == topStationID,
+            isFavourite: favouriteIDs.contains(station.id),
+            topBadgeText: sortMode == .worthTheDrive ? "CHEAPEST" : "TOP",
+            tapAction: stationTapAction,
+            fuelSavings: savingsForStation(station),
+            fuelSavingsAmount: fuelSavingsAmount,
+            savingsPriceConfidence: savingsPriceConfidenceForStation(station),
+            savingsPriceWarning: savingsPriceWarningForStation(station),
+            onToggleFavourite: { onToggleFavourite(station, selectedFuel) },
+            onShowDetails: { detailStation = $0 }
+        )
     }
 
     private var availableSortModes: [SortMode] {
@@ -358,6 +397,7 @@ struct StationsView: View {
                 Text(LocalizedStringKey(blurb))
                     .font(.caption)
                     .foregroundStyle(.secondary)
+                    .fixedSize(horizontal: false, vertical: true)
             }
             Spacer(minLength: 8)
             HStack(spacing: 6) {

FuelBoard/WidgetMockScreen.swift

@@ -76,7 +76,7 @@ struct WidgetMockScreen: View {
         let location = FuelStore.loadLocation().map { Coordinate(lat: $0.lat, lng: $0.lng) }
         // 5 miles — the widget config's default Distance. WidgetDistance itself
         // lives in the widget target, so the preview mirrors its default here.
-        let radiusKM = 5 * 1.60934
+        let radiusKM = 5 * FuelSavingsCalculator.kilometresPerMile
         let all = FuelStore.loadStations()
         let selling = all.filter { station in
             guard station.prices[fuel] != nil else { return false }
@@ -94,7 +94,8 @@ struct WidgetMockScreen: View {
             isFavourites: false,
             location: location,
             locationSource: location != nil ? "live" : "none",
-            unit: FuelStore.loadDistanceUnit()
+            unit: FuelStore.loadDistanceUnit(),
+            bestValueResult: nil
         )
     }
 }

FuelBoard/en.lproj/Localizable.strings

@@ -12,7 +12,7 @@
 "TOP" = "TOP";
 
 /* Stations tab */
-"Closest %@ stations — nearest first, best value within %lld %@ · %lld stations" = "Closest %@ stations — nearest first, best value within %lld %@ · %lld stations";
+"Closest %@ stations — closest first, lowest price within %lld %@ · %lld stations" = "Closest %@ stations — closest first, lowest price within %lld %@ · %lld stations";
 "Cheapest %@ within %lld %@ — %lld stations · tap a station for directions." = "Cheapest %@ within %lld %@ — %lld stations · tap a station for directions.";
 "%@ %@ — tap a station for directions." = "%@ %@ — tap a station for directions.";
 "Fuel type" = "Fuel type";
@@ -26,17 +26,20 @@
 "Good price" = "Good price";
 "Within 1.5p of the cheapest" = "Within 1.5p of the cheapest";
 "Okay" = "Okay";
-"Within 4p of the cheapest" = "Within 4p of the cheapest";
+"More than 1.5p, up to 4p above the cheapest" = "More than 1.5p, up to 4p above the cheapest";
 "Pricey" = "Pricey";
-"More than 4p over the cheapest" = "More than 4p over the cheapest";
+"More than 4p above the cheapest" = "More than 4p above the cheapest";
 "Top result for the current sort" = "Top result for the current sort";
 "Star a station to add it to Favourites" = "Star a station to add it to Favourites";
 /* Star button in the More info sheet heading (accessibility labels) */
 "Add to favourites" = "Add to favourites";
 "Remove from favourites" = "Remove from favourites";
-"Colours match each station's rating on the list" = "Colours match each station's rating on the list";
+"Price differences are shown in pence per litre (p/litre). Colours match each station's rating on the list." = "Price differences are shown in pence per litre (p/litre). Colours match each station's rating on the list.";
 "How Best Value works" = "How Best Value works";
-"Best Value compares each station with the closest one. It works out what you could save at the pump, then takes off the fuel used for the extra return journey." = "Best Value compares each station with the closest one. It works out what you could save at the pump, then takes off the fuel used for the extra return journey.";
+"Best Value compares each station with the closest eligible station by journey distance. It works out what you could save at the pump, then takes off the fuel used for the extra return journey." = "Best Value compares each station with the closest eligible station by journey distance. It works out what you could save at the pump, then takes off the fuel used for the extra return journey.";
+"With a £ budget you spend that amount at each station; the litres differ by station. Savings compare those litres with the same quantity at your closest eligible station, then deduct extra journey fuel. You do not receive cash back." = "With a £ budget you spend that amount at each station; the litres differ by station. Savings compare those litres with the same quantity at your closest eligible station, then deduct extra journey fuel. You do not receive cash back.";
+"Your closest eligible station by journey distance is the baseline — every other saving is measured against it." = "Your closest eligible station by journey distance is the baseline — every other saving is measured against it.";
+"Savings below are estimated against the closest eligible station by journey distance — the same baseline as the Stations list." = "Savings below are estimated against the closest eligible station by journey distance — the same baseline as the Stations list.";
 "Your fill-up amount and MPG are used to show whether you could save overall." = "Your fill-up amount and MPG are used to show whether you could save overall.";
 "Results are marked “Approx.” until road distances are available." = "Results are marked “Approx.” until road distances are available.";
 
@@ -70,13 +73,17 @@
 "More info" = "More info";
 "Name" = "Name";
 "Address" = "Address";
-"Distance" = "Distance";
+"Copies the postcode" = "Copies the postcode";
+"Postcode copied" = "Postcode copied";
+"Address: %@" = "Address: %@";
+"Directions to %@" = "Directions to %@";
+"Opens Apple Maps with driving directions" = "Opens Apple Maps with driving directions";
 "Show introduction" = "Replay onboarding";
 "Replay the welcome screen, including the location and notification permission prompts." = "Replay the welcome screen, including the location and notification permission prompts.";
 "Test alert notification (real data)" = "Test alert notification (real data)";
 "Send plain test notification" = "Send plain test notification";
 "Debug" = "Debug";
-"The first button applies the real criteria — cheapest %@ station within %@ of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (nearest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions. Cheapest in range mirrors the app list (selected fuel + distance); the in-range count mirrors the alert radius." = "The first button applies the real criteria — cheapest %@ station within %@ of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (nearest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions. Cheapest in range mirrors the app list (selected fuel + distance); the in-range count mirrors the alert radius.";
+"The first button applies the real criteria — cheapest %@ station within %@ of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (closest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions. Cheapest in range mirrors the app list (selected fuel + distance); the in-range count mirrors the alert radius." = "The first button applies the real criteria — cheapest %@ station within %@ of you — and sends the actual station's name, price and coordinates. The second fires with no criteria at all (closest seller), still carrying a real station, just to verify a notification appears and tapping it opens directions. Cheapest in range mirrors the app list (selected fuel + distance); the in-range count mirrors the alert radius.";
 "Widget Diagnostics" = "Widget Diagnostics";
 "Each beacon is written by the widget extension at the end of every timeline entry for that intent type (keychain, so it survives free-SideStore installs). A missing SMALL beacon after adding the small widget means its timeline never reaches the provider. Installed widgets come from WidgetCenter." = "Each beacon is written by the widget extension at the end of every timeline entry for that intent type (keychain, so it survives free-SideStore installs). A missing SMALL beacon after adding the small widget means its timeline never reaches the provider. Installed widgets come from WidgetCenter.";
 "SMALL: %@" = "SMALL: %@";
@@ -134,7 +141,7 @@
 "Connection shows the source of the current prices (CSV mirror or API). Data updated is the latest price change reported by the GOV.UK server itself. Prices use the UK Fuel Finder dataset (Open Government Licence) and refresh up to twice a day." = "Connection shows the source of the current prices (CSV mirror or API). Data updated is the latest price change reported by the GOV.UK server itself. Prices use the UK Fuel Finder dataset (Open Government Licence) and refresh up to twice a day.";
 "Prices near you" = "Prices near you";
 "FuelBoard uses your location to show prices around you and rank stations by distance. Your position never leaves the device." = "FuelBoard uses your location to show prices around you and rank stations by distance. Your position never leaves the device.";
-"Location was denied. You can still browse all stations, but \"nearest\" sorting needs it." = "Location was denied. You can still browse all stations, but \"nearest\" sorting needs it.";
+"Location was denied. You can still browse all stations, but \"closest\" sorting needs it." = "Location was denied. You can still browse all stations, but \"closest\" sorting needs it.";
 "Allowed" = "Allowed";
 "The system prompt will appear next." = "The system prompt will appear next.";
 "FuelBoard can notify you when you're approaching the cheapest station in your alert radius — even with the app closed. You can switch this off in the Alerts tab." = "FuelBoard can notify you when you're approaching the cheapest station in your alert radius — even with the app closed. You can switch this off in the Alerts tab.";
@@ -212,3 +219,18 @@
 "A-roads and motorway exits. Wide early warning for longer trips — but in town it rarely fires, because you're usually already inside the circle." = "A-roads and motorway exits. Wide early warning for longer trips — but in town it rarely fires, because you're usually already inside the circle.";
 "Long-distance journeys. Maximum reach: a ping when a cheap station is coming up from far out. In town this essentially never fires." = "Long-distance journeys. Maximum reach: a ping when a cheap station is coming up from far out. In town this essentially never fires.";
 "%@ — %@" = "%@ — %@";
+
+/* Best Value calculation and price confidence */
+"£ compares the litres your budget buys at each station; Litres compares one fixed quantity." = "£ compares the litres your budget buys at each station; Litres compares one fixed quantity.";
+"You pay the selected budget here. The saving compares the same litres at your closest eligible station; litres differ between stations, and this is not a refund." = "You pay the selected budget here. The saving compares the same litres at your closest eligible station; litres differ between stations, and this is not a refund.";
+"Best Value unavailable · price confidence insufficient" = "Best Value unavailable · price confidence insufficient";
+"Best Value unavailable · location needed" = "Best Value unavailable · location needed";
+"price order · Best Value unavailable" = "price order · Best Value unavailable";
+"your order" = "your order";
+"Price updated" = "Price updated";
+"Price age unavailable or too old — not a Best Value recommendation." = "Price age unavailable or too old — not a Best Value recommendation.";
+"%@ ago" = "%@ ago";
+"Not provided" = "Not provided";
+"Fuel you'll receive" = "Fuel you'll receive";
+"Best Value unavailable: no eligible price comparison. Stations and prices remain visible below." = "Best Value unavailable: no eligible price comparison. Stations and prices remain visible below.";
+"Compared with your closest eligible station." = "Compared with your closest eligible station.";

FuelBoardTests/Sources/FuelBoardShared/FuelPriceFreshness.swift

@@ -0,0 +1 @@
+../../../Shared/FuelPriceFreshness.swift

FuelBoardTests/Tests/FuelBoardSharedTests/FuelBoardTests.swift

@@ -211,10 +211,10 @@ final class DistanceTests: XCTestCase {
     }
 
     func testMilesConversion() {
-        // 5 miles ≈ 8.05 km (app uses × 1.60934)
-        XCTAssertEqual(5 * 1.60934, 8.0467, accuracy: 0.001)
-        // 262 km ≈ 162.8 miles (display uses × 0.621371)
-        XCTAssertEqual(262 * 0.621371, 162.8, accuracy: 0.1)
+        // 5 miles ≈ 8.05 km using the shared exact conversion
+        XCTAssertEqual(5 * FuelSavingsCalculator.kilometresPerMile, 8.04672, accuracy: 0.001)
+        // 262 km ≈ 162.8 miles using the shared exact conversion
+        XCTAssertEqual(262 / FuelSavingsCalculator.kilometresPerMile, 162.8, accuracy: 0.1)
     }
 }
 
@@ -267,14 +267,14 @@ final class FuelTypeLabelTests: XCTestCase {
     }
 
     func testDistanceUnitConversion() {
-        XCTAssertEqual(DistanceUnit.miles.toKM(1), 1.60934, accuracy: 0.00001)
+        XCTAssertEqual(DistanceUnit.miles.toKM(1), 1.609344, accuracy: 0.00001)
         XCTAssertEqual(DistanceUnit.kilometers.toKM(5), 5)
-        XCTAssertEqual(DistanceUnit.miles.fromKM(1.60934), 1, accuracy: 0.00001)
+        XCTAssertEqual(DistanceUnit.miles.fromKM(1.609344), 1, accuracy: 0.00001)
         XCTAssertEqual(DistanceUnit.kilometers.fromKM(2.5), 2.5)
     }
 
     func testDistanceUnitFormat() {
-        XCTAssertEqual(DistanceUnit.miles.format(1.60934), "1.0 mi")
+        XCTAssertEqual(DistanceUnit.miles.format(1.609344), "1.0 mi")
         XCTAssertEqual(DistanceUnit.kilometers.format(3.4), "3.4 km")
     }
 }
@@ -400,7 +400,7 @@ final class AlertRadiusFollowTests: XCTestCase {
         FuelStore.saveDistanceUnit(.miles)
         FuelStore.saveStationLimit(5)
         let eff = FuelStore.effectiveAlertsRadiusKM(followsSearch: true, manualKM: 3)
-        XCTAssertEqual(eff, 5 * 1.60934, accuracy: 0.001)
+        XCTAssertEqual(eff, 5 * FuelSavingsCalculator.kilometresPerMile, accuracy: 0.001)
     }
 }
 
@@ -731,7 +731,7 @@ final class RoadDistanceCacheTests: XCTestCase {
             sourceLat: sourceLat, sourceLng: sourceLng,
             entries: ["far": .init(meters: 23_500, lat: 51.5074, lng: -0.1278, returnMeters: 23_500)])
 
-        let tenMilesKM = 10 * 1.60934
+        let tenMilesKM = 10 * FuelSavingsCalculator.kilometresPerMile
         XCTAssertLessThan(far.distanceKM(to: sourceLat, lng2: sourceLng), tenMilesKM,
                           "fixture: the straight line must sit INSIDE the 10-mile radius")
         XCTAssertGreaterThan(FuelStore.displayDistanceKM(station: far, userLat: sourceLat, userLng: sourceLng),
@@ -743,7 +743,7 @@ final class RoadDistanceCacheTests: XCTestCase {
                                                       userLat: sourceLat, userLng: sourceLng),
                        "a station whose row reads 14.6 mi must not appear in a 10-mile list")
         // The same station is back once the radius actually covers its distance.
-        XCTAssertTrue(FuelStore.isWithinDisplayRadius(station: far, radiusKM: 15 * 1.60934,
+        XCTAssertTrue(FuelStore.isWithinDisplayRadius(station: far, radiusKM: 15 * FuelSavingsCalculator.kilometresPerMile,
                                                      userLat: sourceLat, userLng: sourceLng))
         // …and an unknown station (no cached route) still tests its displayed
         // straight line, so nothing changes for the bulk of the list.
@@ -783,10 +783,10 @@ final class RoadDistanceCacheTests: XCTestCase {
         XCTAssertFalse(confirmed.isApproximate, "a cached road distance is not an approximation")
         XCTAssertEqual(confirmed.km, 3.2, accuracy: 0.0001)
         XCTAssertEqual(confirmed.label(unit: .miles), "2.0 mi")
-        XCTAssertEqual(confirmed.labelWithReturn(unit: .miles), "2.0 mi (4.0 mi return)")
-        XCTAssertEqual(confirmed.labelWithReturn(unit: .kilometers), "3.2 km (6.4 km return)")
+        XCTAssertEqual(confirmed.labelWithReturn(unit: .miles), "2.0 mi (4.2 mi return)")
+        XCTAssertEqual(confirmed.labelWithReturn(unit: .kilometers), "3.2 km (6.8 km return)")
         XCTAssertEqual(confirmed.spokenLabel(unit: .miles), "2.0 miles")
-        XCTAssertEqual(confirmed.spokenLabelWithReturn(unit: .miles), "2.0 miles, 4.0 miles return")
+        XCTAssertEqual(confirmed.spokenLabelWithReturn(unit: .miles), "2.0 miles, 4.2 miles return")
 
         let approximate = FuelStore.stationDistanceDisplay(station: unrouted, userLat: 51.6, userLng: -0.1)
         XCTAssertTrue(approximate.isApproximate, "the straight-line fallback must be identified as one")
@@ -794,11 +794,40 @@ final class RoadDistanceCacheTests: XCTestCase {
         XCTAssertEqual(approximate.label(unit: .miles),
                        "Approx. " + DistanceUnit.miles.format(approximate.km))
         XCTAssertEqual(approximate.labelWithReturn(unit: .miles),
-                       "Approx. \(DistanceUnit.miles.format(approximate.km)) (\(DistanceUnit.miles.format(approximate.km * 2)) return)")
+                       "Approx. " + DistanceUnit.miles.format(approximate.km) + " (Approx. " + DistanceUnit.miles.format(approximate.km * 2) + " return)")
         XCTAssertEqual(approximate.spokenLabel(unit: .kilometers),
                        "Approximately " + DistanceUnit.kilometers.spoken(approximate.km))
         XCTAssertEqual(approximate.spokenLabelWithReturn(unit: .kilometers),
-                       "Approximately \(DistanceUnit.kilometers.spoken(approximate.km)), \(DistanceUnit.kilometers.spoken(approximate.km * 2)) return")
+                       "Approximately \(DistanceUnit.kilometers.spoken(approximate.km)), Approximately \(DistanceUnit.kilometers.spoken(approximate.km * 2)) return")
+    }
+
+    func testDisplayedReturnUsesTheIndependentlyMeasuredReturnRoute() {
+        FuelStore.setAccurateDistancesEnabled(true)
+        let station = station("separate-legs", 51.5074, -0.1278)
+        FuelStore.saveRoadDistances(
+            sourceLat: 51.6,
+            sourceLng: -0.1,
+            entries: ["separate-legs": .init(
+                meters: 4_650,
+                lat: station.lat,
+                lng: station.lng,
+                returnMeters: 4_820
+            )],
+            complete: true
+        )
+
+        let display = FuelStore.stationDistanceDisplay(
+            station: station,
+            userLat: 51.6,
+            userLng: -0.1
+        )
+
+        XCTAssertEqual(display.km, 4.65, accuracy: 1e-12)
+        XCTAssertEqual(display.returnKM, 9.47, accuracy: 1e-12)
+        XCTAssertFalse(display.isApproximate)
+        XCTAssertFalse(display.returnIsApproximate)
+        XCTAssertEqual(display.labelWithReturn(unit: .miles), "2.9 mi (5.9 mi return)")
+        XCTAssertEqual(display.spokenLabelWithReturn(unit: .miles), "2.9 miles, 5.9 miles return")
     }
 
     /// The marker tracks the cache on its own: same station, bare figure once its
@@ -961,7 +990,7 @@ final class RoadDistanceCacheTests: XCTestCase {
         let display = FuelStore.stationDistanceDisplay(station: routed, userLat: 51.6, userLng: -0.1)
         XCTAssertTrue(display.isApproximate, "the browse layer must never serve routes with the mode off")
         XCTAssertEqual(display.km, routed.distanceKM(to: 51.6, lng2: -0.1), accuracy: 0.0001)
-        XCTAssertTrue(FuelStore.isWithinDisplayRadius(station: routed, radiusKM: 10 * 1.60934,
+        XCTAssertTrue(FuelStore.isWithinDisplayRadius(station: routed, radiusKM: 10 * FuelSavingsCalculator.kilometresPerMile,
                                                       userLat: 51.6, userLng: -0.1),
                       "with the mode off the radius is a straight-line radius, agreeing with the rows")
 
@@ -1000,7 +1029,7 @@ final class RoadDistanceCacheTests: XCTestCase {
         let display = FuelStore.stationDistanceDisplay(station: routed, userLat: 51.6, userLng: -0.1)
         XCTAssertFalse(display.isApproximate)
         XCTAssertEqual(display.km, 23.5, accuracy: 0.0001)
-        XCTAssertFalse(FuelStore.isWithinDisplayRadius(station: routed, radiusKM: 10 * 1.60934,
+        XCTAssertFalse(FuelStore.isWithinDisplayRadius(station: routed, radiusKM: 10 * FuelSavingsCalculator.kilometresPerMile,
                                                        userLat: 51.6, userLng: -0.1),
                        "in this mode a 10-mile radius is 10 miles of driving, matching the routed rows")
     }

FuelBoardTests/Tests/FuelBoardSharedTests/FuelPriceFreshnessTests.swift

@@ -0,0 +1,251 @@
+import XCTest
+#if SWIFT_PACKAGE
+@testable import FuelBoardShared
+#endif
+
+final class FuelPriceFreshnessTests: XCTestCase {
+    private let now = Date(timeIntervalSince1970: 1_792_022_400)
+
+    private func station(
+        priceUpdated: TimeInterval? = nil,
+        priceUpdatedByFuel: [FuelType: TimeInterval]? = nil
+    ) -> FuelStation {
+        FuelStation(
+            id: "freshness-station",
+            name: "Freshness Station",
+            brand: "Test",
+            address: "1 High Street",
+            postcode: "BD1 1AA",
+            lat: 53.79,
+            lng: -1.75,
+            prices: [.diesel: 129.9, .e10: 169.9],
+            priceUpdated: priceUpdated,
+            priceUpdatedByFuel: priceUpdatedByFuel
+        )
+    }
+
+    func testPerGradeTimestampIsDecodedAndEligibleWhenFresh() throws {
+        let json = """
+        {
+          "stations": [{
+            "id": "s1",
+            "name": "LISTER ARMS",
+            "brand": "Shell",
+            "address": "MANCHESTER ROAD, BRADFORD",
+            "postcode": "BD5 7JX",
+            "lat": 53.78,
+            "lng": -1.75,
+            "prices": {"E10": 169.9, "DIESEL": 129.9},
+            "price_updated": "2026-09-25T07:45:52Z",
+            "price_updated_by_grade": {
+              "E10": "2026-10-14T07:45:52Z",
+              "DIESEL": "2026-10-14T07:45:52Z"
+            }
+          }]
+        }
+        """
+        let stations = try FuelPriceProvider.decodeStations(from: Data(json.utf8))
+        let decoded = try XCTUnwrap(stations.first)
+
+        XCTAssertEqual(decoded.priceUpdatedByFuel?[.diesel],
+                       ISO8601DateFormatter.fuelBoardDate("2026-10-14T07:45:52Z")?.timeIntervalSince1970)
+        let assessment = FuelPriceFreshness.assessment(for: decoded, fuel: .diesel, now: now)
+        XCTAssertEqual(assessment.source, .gradeSpecific)
+        XCTAssertEqual(assessment.status, .fresh)
+        XCTAssertTrue(assessment.isEligibleForBestValue)
+    }
+
+    func testStationWideTimestampIsNotPresentedAsGradeSpecificOrEligible() {
+        let updated = now.addingTimeInterval(-FuelPriceFreshness.warningAge / 2).timeIntervalSince1970
+        let assessment = FuelPriceFreshness.assessment(
+            for: station(priceUpdated: updated), fuel: .diesel, now: now
+        )
+
+        XCTAssertEqual(assessment.source, .stationWide)
+        XCTAssertEqual(assessment.status, .fresh)
+        XCTAssertEqual(assessment.confidence, .provisional)
+        XCTAssertTrue(assessment.recommendationEligibility == .eligible)
+        XCTAssertTrue(assessment.isEligibleForBestValue)
+        XCTAssertTrue(assessment.warning)
+        XCTAssertTrue(assessment.displayLabel.contains("station-wide"))
+    }
+
+    func testMoreInfoReportsOneStationPriceAge() {
+        let updated = now.addingTimeInterval(-28 * 60 * 60).timeIntervalSince1970
+        let assessment = FuelPriceFreshness.assessment(for: station(priceUpdated: updated), fuel: .e10, now: now)
+        XCTAssertEqual(assessment.updateAgeLabel, "28h ago")
+        XCTAssertEqual(assessment.source, .stationWide)
+        XCTAssertEqual(assessment.status, .fresh)
+    }
+
+    func testOlderFuelSpecificTimestampStillReportsItsOwnAgeOnce() {
+        let updated = now.addingTimeInterval(-10 * 86_400).timeIntervalSince1970
+        let priced = station(priceUpdatedByFuel: [.diesel: updated])
+        let assessment = FuelPriceFreshness.assessment(for: priced, fuel: .diesel, now: now)
+        XCTAssertEqual(assessment.updateAgeLabel, "10d ago")
+        XCTAssertEqual(assessment.source, .gradeSpecific)
+    }
+
+    func testMissingUpdateTimeReadsNotProvided() {
+        let assessment = FuelPriceFreshness.assessment(for: station(), fuel: .e10, now: now)
+        XCTAssertEqual(assessment.updateAgeLabel, "Not provided")
+    }
+
+    func testProvisionalSavingAddsNoSecondWarningLine() {
+        let recent = now.addingTimeInterval(-28 * 60 * 60).timeIntervalSince1970
+        let stationWide = station(priceUpdated: recent)
+        let gradeSpecific = station(priceUpdatedByFuel: [.e10: recent])
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(
+            station: gradeSpecific, fuel: .e10, baseline: stationWide, now: now), .provisional)
+        XCTAssertNil(FuelPriceFreshness.comparisonWarning(
+            station: stationWide, fuel: .e10, baseline: stationWide, now: now))
+        XCTAssertNil(FuelPriceFreshness.comparisonWarning(
+            station: gradeSpecific, fuel: .e10, baseline: stationWide, now: now))
+    }
+
+    func testIneligibleComparisonStillExplainsItself() {
+        let old = now.addingTimeInterval(-FuelPriceFreshness.staleAge - 1).timeIntervalSince1970
+        let stale = station(priceUpdatedByFuel: [.diesel: old])
+        XCTAssertEqual(FuelPriceFreshness.comparisonWarning(
+            station: stale, fuel: .diesel, baseline: stale, now: now),
+            "Price age unavailable or too old — not a Best Value recommendation.")
+    }
+
+    func testStationWideTimestampAtWarningBoundaryChangesRecommendationEligibility() {
+        let updated = now.addingTimeInterval(-FuelPriceFreshness.warningAge).timeIntervalSince1970
+        let onBoundary = FuelPriceFreshness.assessment(for: station(priceUpdated: updated), fuel: .diesel, now: now)
+        XCTAssertEqual(onBoundary.status, .fresh)
+        XCTAssertTrue(onBoundary.isEligibleForBestValue)
+        let pastBoundary = FuelPriceFreshness.assessment(
+            for: station(priceUpdated: updated - 1), fuel: .diesel, now: now)
+        XCTAssertEqual(pastBoundary.status, .warning)
+        XCTAssertFalse(pastBoundary.isEligibleForBestValue)
+    }
+
+    func testStationWideTimestampOlderThanWarningThresholdCannotRecommendSuspiciousDiesel() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        let shell = station(priceUpdated: now.addingTimeInterval(-20 * 86_400).timeIntervalSince1970)
+        let age = FuelPriceFreshness.assessment(for: shell, fuel: .diesel, now: now)
+        XCTAssertEqual(age.status, .warning)
+        XCTAssertFalse(age.isEligibleForBestValue)
+        XCTAssertEqual(shell.prices[.diesel], 129.9)
+    }
+
+    func testComparisonConfidenceRejectsMissingSelectedFuelPriceEvenWithFreshTimestamp() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        let updated = now.addingTimeInterval(-86_400).timeIntervalSince1970
+        let dieselOnly = FuelStation(id: "diesel", name: "Diesel", brand: "", address: "", postcode: "",
+                                     lat: 53, lng: -1, prices: [.diesel: 129.9], priceUpdated: nil,
+                                     priceUpdatedByFuel: [.e10: updated])
+        let e10 = FuelStation(id: "petrol", name: "Petrol", brand: "", address: "", postcode: "",
+                               lat: 53, lng: -1, prices: [.e10: 169.9], priceUpdated: nil,
+                               priceUpdatedByFuel: [.e10: updated])
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(station: dieselOnly, fuel: .e10,
+                                                                 baseline: e10, now: now), .ineligible)
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(station: e10, fuel: .e10,
+                                                                 baseline: dieselOnly, now: now), .ineligible)
+    }
+
+    func testComparisonConfidenceRequiresBothSelectedGradeTimestamps() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        let recent = now.addingTimeInterval(-86_400).timeIntervalSince1970
+        let old = now.addingTimeInterval(-20 * 86_400).timeIntervalSince1970
+        let verified = station(priceUpdatedByFuel: [.diesel: recent])
+        let provisional = station(priceUpdated: recent)
+        let oldStationWide = station(priceUpdated: old)
+        let oldGrade = station(priceUpdatedByFuel: [.diesel: old])
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(station: verified, fuel: .diesel,
+                                                                 baseline: verified, now: now), .verified)
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(station: verified, fuel: .diesel,
+                                                                 baseline: provisional, now: now), .provisional)
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(station: oldGrade, fuel: .diesel,
+                                                                 baseline: verified, now: now), .provisional)
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(station: verified, fuel: .diesel,
+                                                                 baseline: oldStationWide, now: now), .ineligible)
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(station: provisional, fuel: .diesel,
+                                                                 baseline: verified, now: now), .provisional)
+        XCTAssertEqual(FuelPriceFreshness.comparisonConfidence(station: verified, fuel: .e10,
+                                                                 baseline: verified, now: now), .ineligible)
+    }
+
+    func testNonFiniteAndExtremeEpochsCannotBecomeTrusted() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        for value in [Double.nan, .infinity, -.infinity, Double.greatestFiniteMagnitude, -Double.greatestFiniteMagnitude] {
+            let assessment = FuelPriceFreshness.assessment(
+                priceUpdated: value, priceUpdatedByFuel: nil, fuel: .diesel, now: now)
+            XCTAssertFalse(assessment.isEligibleForBestValue)
+            XCTAssertTrue(assessment.warning)
+        }
+    }
+
+    func testMissingAndMalformedTimestampsAreUnknownAndIneligible() {
+        let missing = FuelPriceFreshness.assessment(for: station(), fuel: .diesel, now: now)
+        XCTAssertEqual(missing.status, .unknown)
+        XCTAssertEqual(missing.source, .unknown)
+        XCTAssertFalse(missing.isEligibleForBestValue)
+
+        let malformed = FuelPriceFreshness.assessment(
+            priceUpdated: "not-a-date", priceUpdatedByGrade: nil, fuel: .diesel, now: now
+        )
+        XCTAssertEqual(malformed.status, .invalid)
+        XCTAssertFalse(malformed.isEligibleForBestValue)
+    }
+
+    func testStaleDisplayLabelDoesNotCallIneligiblePriceProvisional() {
+        let stale = station(priceUpdatedByFuel: [
+            .diesel: now.addingTimeInterval(-FuelPriceFreshness.staleAge - 1).timeIntervalSince1970
+        ])
+        let assessment = FuelPriceFreshness.assessment(for: stale, fuel: .diesel, now: now)
+        XCTAssertFalse(assessment.isEligibleForBestValue)
+        XCTAssertFalse(assessment.displayLabel.contains("provisional"))
+        XCTAssertTrue(assessment.displayLabel.contains("outdated"))
+    }
+
+    func testStaleAndFutureGradeTimestampsAreRejected() {
+        let stale = station(priceUpdatedByFuel: [
+            .diesel: now.addingTimeInterval(-FuelPriceFreshness.staleAge - 1).timeIntervalSince1970
+        ])
+        let staleAssessment = FuelPriceFreshness.assessment(for: stale, fuel: .diesel, now: now)
+        XCTAssertEqual(staleAssessment.status, .stale)
+        XCTAssertFalse(staleAssessment.isEligibleForBestValue)
+        XCTAssertTrue(staleAssessment.warning)
+
+        let future = station(priceUpdatedByFuel: [
+            .diesel: now.addingTimeInterval(FuelPriceFreshness.futureTolerance + 1).timeIntervalSince1970
+        ])
+        let futureAssessment = FuelPriceFreshness.assessment(for: future, fuel: .diesel, now: now)
+        XCTAssertEqual(futureAssessment.status, .invalid)
+        XCTAssertFalse(futureAssessment.isEligibleForBestValue)
+    }
+
+    func testMalformedAndFutureSourceValuesDoNotCrashOrProduceNegativeAge() {
+        let malformed = FuelPriceFreshness.assessment(
+            priceUpdated: "2026-99-99T99:99:99Z",
+            priceUpdatedByGrade: ["DIESEL": "2026-99-99T99:99:99Z"],
+            fuel: .diesel,
+            now: now
+        )
+        XCTAssertNil(malformed.age)
+        XCTAssertFalse(malformed.isEligibleForBestValue)
+
+        let future = FuelPriceFreshness.assessment(
+            priceUpdated: now.addingTimeInterval(86_400).timeIntervalSince1970,
+            priceUpdatedByFuel: nil,
+            fuel: .diesel,
+            now: now
+        )
+        XCTAssertNil(future.age)
+        XCTAssertFalse(future.isEligibleForBestValue)
+    }
+}
+
+private extension ISO8601DateFormatter {
+    static func fuelBoardDate(_ string: String) -> Date? {
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
+        return formatter.date(from: string) ?? {
+            formatter.formatOptions = [.withInternetDateTime]
+            return formatter.date(from: string)
+        }()
+    }
+}

FuelBoardTests/Tests/FuelBoardSharedTests/FuelSavingsCalculationAuditTests.swift

@@ -48,6 +48,42 @@ final class FuelSavingsCalculationAuditTests: XCTestCase {
 
     // MARK: - 1. Unit conversion
 
+    func testBudgetExamplesAcrossAllFuelTypes() throws {
+        for fuel in FuelType.allCases {
+            let base = FuelStation(id: "base", name: "Base", brand: "", address: "", postcode: "", lat: 53, lng: -1, prices: [fuel: 199.9], priceUpdated: nil)
+            let other = FuelStation(id: "other", name: "Other", brand: "", address: "", postcode: "", lat: 53, lng: -1, prices: [fuel: 129.9], priceUpdated: nil)
+            let settings = FuelSavingsSettings(enabled: true, mpg: 30, preferredAmount: .init(value: 40, unit: .pounds))
+            for budget in [20.0, 40, 60, 73, 100] {
+                let result = FuelSavingsEstimator.availability(station: other, fuel: fuel, baseline: base,
+                    settings: settings, amount: .init(value: budget, unit: .pounds),
+                    journey: .init(miles: 8.3, basis: .roadRoute),
+                    baselineJourney: .init(miles: 0.9, basis: .roadRoute))?.result
+                let volume = budget / 1.299
+                XCTAssertEqual(result?.fillLitres ?? 0, volume, accuracy: 1e-9)
+                XCTAssertEqual(result?.grossSavingGBP ?? 0, volume * 0.7, accuracy: 1e-9)
+                XCTAssertEqual(result?.netSavingGBP ?? 0, volume * 0.7 - 7.4 / 30 * 4.54609 * 1.299, accuracy: 1e-9)
+            }
+        }
+    }
+
+    func testCandidateBudgetAndEqualQuantitySavingsForEveryFuel() throws {
+        for fuel in FuelType.allCases {
+            let candidate = FuelStation(id: "candidate-\(fuel.rawValue)", name: "Candidate", brand: "", address: "", postcode: "", lat: 53.7, lng: -1.8, prices: [fuel: 129.9], priceUpdated: nil)
+            let baseline = FuelStation(id: "baseline-\(fuel.rawValue)", name: "Nearest", brand: "", address: "", postcode: "", lat: 53.7, lng: -1.8, prices: [fuel: 199.9], priceUpdated: nil)
+            let configured = FuelSavingsSettings(enabled: true, mpg: 30, preferredAmount: .init(value: 60, unit: .pounds))
+            let money = FuelSavingsEstimator.availability(station: candidate, fuel: fuel, baseline: baseline, settings: configured,
+                amount: .init(value: 60, unit: .pounds), journey: .init(miles: 8.3, basis: .roadRoute),
+                baselineJourney: .init(miles: 0.9, basis: .roadRoute))?.result
+            let litres = FuelSavingsEstimator.availability(station: candidate, fuel: fuel, baseline: baseline, settings: configured,
+                amount: .init(value: 60 / 1.299, unit: .litres), journey: .init(miles: 8.3, basis: .roadRoute),
+                baselineJourney: .init(miles: 0.9, basis: .roadRoute))?.result
+            XCTAssertEqual(money?.fillLitres ?? 0, 60 / 1.299, accuracy: 1e-8, fuel.rawValue)
+            XCTAssertEqual(money?.grossSavingGBP ?? 0, litres?.grossSavingGBP ?? -1, accuracy: 1e-8, fuel.rawValue)
+            XCTAssertEqual(money?.netSavingGBP ?? 0, litres?.netSavingGBP ?? -1, accuracy: 1e-8, fuel.rawValue)
+            XCTAssertEqual(money?.netSavingGBP ?? 0, (money?.grossSavingGBP ?? 0) - (money?.extraDrivingCostGBP ?? 0), accuracy: 1e-8, fuel.rawValue)
+        }
+    }
+
     func testImperialGallonIsUsedNotTheUSGallon() {
         XCTAssertEqual(FuelSavingsCalculator.imperialGallonLitres, 4.54609)
         XCTAssertNotEqual(FuelSavingsCalculator.imperialGallonLitres, 3.785411784,
@@ -263,6 +299,23 @@ final class FuelSavingsCalculationAuditTests: XCTestCase {
         XCTAssertEqual(FuelSavingsFormat.money(0), "£0.00")
     }
 
+    func testIndependentlyRoundedFinancialComponentsMayDifferFromRoundedTotalByOnePenny() {
+        let gross = 1.234
+        let drivingCost = 0.005
+        let net = gross - drivingCost
+
+        XCTAssertEqual(FuelSavingsFormat.money(gross), "£1.23")
+        XCTAssertEqual(FuelSavingsFormat.money(drivingCost), "£0.01")
+        XCTAssertEqual(FuelSavingsFormat.money(net), "£1.23")
+        let independentlyRoundedSubtraction = 1.23 - 0.01
+        XCTAssertEqual(independentlyRoundedSubtraction, 1.22, accuracy: 1e-12)
+        XCTAssertNotEqual(
+            FuelSavingsFormat.money(independentlyRoundedSubtraction),
+            FuelSavingsFormat.money(net),
+            "the raw total remains authoritative; independently rounded components need not add back exactly"
+        )
+    }
+
     func testSortingUsesTheUnroundedNetSoRoundedTiesStillOrderCorrectly() {
         // Two rows that both DISPLAY "£0.18 worse off" but differ in the raw
         // figure: the sort must use the raw value, never the shown one.
@@ -480,6 +533,6 @@ final class FuelSavingsCalculationAuditTests: XCTestCase {
         )?.result
         XCTAssertEqual(result?.status, .baseline)
         XCTAssertEqual(result?.netSavingGBP, 0)
-        XCTAssertEqual(result?.headline(), "Closest station")
+        XCTAssertEqual(result?.headline(), "Closest eligible station")
     }
 }

FuelBoardTests/Tests/FuelBoardSharedTests/FuelSavingsEstimateTests.swift

@@ -41,6 +41,20 @@ final class FuelSavingsEstimateTests: XCTestCase {
         FuelSavingsJourney(miles: miles, basis: .straightLine)
     }
 
+    func testDifferentFuelNeverUsesAnotherGradeAsItsBaseline() {
+        let petrolOnly = FuelStation(id: "petrol", name: "Petrol", brand: "", address: "", postcode: "", lat: 53, lng: -1,
+            prices: [.e10: 199.9], priceUpdated: nil)
+        let dieselOnly = FuelStation(id: "diesel", name: "Diesel", brand: "", address: "", postcode: "", lat: 53, lng: -1,
+            prices: [.diesel: 129.9], priceUpdated: nil)
+        let nearest = FuelSavingsEstimator.baselineStation([petrolOnly, dieselOnly], fuel: .diesel) { station in
+            self.straightLine(station.id == "petrol" ? 0.5 : 1)
+        }
+        XCTAssertEqual(nearest?.id, "diesel")
+        let unavailable = FuelSavingsEstimator.availability(station: dieselOnly, fuel: .diesel, baseline: petrolOnly,
+            settings: settings, amount: amount, journey: straightLine(1), baselineJourney: straightLine(0.5))
+        XCTAssertEqual(unavailable, .unavailable("No comparison station"))
+    }
+
     func testCheaperStationThreePointFiveMilesAwayIsRankedFirstWithASaving() {
         // Nearest station: 1 mile away at 145.9p. The station the user can see
         // in the Cheapest tab: 3.5 miles away at 138.9p.
@@ -85,6 +99,24 @@ final class FuelSavingsEstimateTests: XCTestCase {
                        "unmeasured routes are reported as straight-line estimates")
     }
 
+    func testBaselineOutsideFilteredPoolStillRanksByNetSaving() {
+        let baseline = station("nearest-outside-radius", price: 199.9)
+        let cheap = station("z-cheap", price: 129.9)
+        let expensive = station("a-expensive", price: 198.9)
+        let ranked = FuelSavingsEstimator.ranked(
+            [expensive, cheap], fuel: .e10, baseline: baseline,
+            settings: settings, amount: amount,
+            journeyMiles: { s in self.straightLine(s.id == baseline.id ? 0.8 : 4.0) }
+        )
+        XCTAssertEqual(ranked.map(\.id), ["z-cheap", "a-expensive"])
+        let expected = FuelSavingsEstimator.availability(
+            station: cheap, fuel: .e10, baseline: baseline,
+            settings: settings, amount: amount,
+            journey: straightLine(4.0), baselineJourney: straightLine(0.8)
+        )?.result
+        XCTAssertGreaterThan(expected?.netSavingGBP ?? -1, 0)
+    }
+
     func testEveryPricedStationInThePoolIsEstimatedNotJustAShortlist() {
         // 40 stations, but only the first one has a measured road route — the
         // old implementation capped the whole ranking to 12 shortlisted
@@ -159,6 +191,56 @@ final class FuelSavingsEstimateTests: XCTestCase {
         XCTAssertEqual(result?.distanceBasis, .straightLine)
     }
 
+    func testBestValueBaselineSkipsClosestStalePriceButKeepsThatStationVisible() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        func priced(_ id: String, _ price: Double, _ daysOld: Double) -> FuelStation {
+            FuelStation(id: id, name: id, brand: "", address: "", postcode: "", lat: 53, lng: -1,
+                        prices: [.e10: price], priceUpdated: now.addingTimeInterval(-daysOld * 86_400).timeIntervalSince1970)
+        }
+        let staleClosest = priced("stale-closest", 199.9, 27)
+        let eligibleClosest = priced("eligible-closest", 170.9, 1)
+        let eligibleFurther = priced("eligible-further", 150.9, 1)
+        let pool = [staleClosest, eligibleClosest, eligibleFurther]
+        let journeys: (FuelStation) -> FuelSavingsJourney? = { station in
+            self.straightLine(station.id == "stale-closest" ? 0.8 : station.id == "eligible-closest" ? 1.6 : 3.0)
+        }
+        let baseline = FuelSavingsEstimator.bestValueBaselineStation(pool, fuel: .e10,
+                                                                       journeyMiles: journeys, now: now)
+        XCTAssertEqual(baseline?.id, "eligible-closest")
+        XCTAssertEqual(FuelSavingsEstimator.baselineStation(pool, fuel: .e10, journeyMiles: journeys)?.id,
+                       "stale-closest", "non-Best-Value closest behaviour must stay unchanged")
+        let ranked = FuelSavingsEstimator.ranked(pool, fuel: .e10, baseline: baseline,
+            settings: briefSettings, amount: briefAmount, journeyMiles: journeys, now: now)
+        XCTAssertEqual(ranked.first?.id, "eligible-further")
+        XCTAssertTrue(ranked.contains(where: { $0.id == "stale-closest" }))
+        XCTAssertFalse(FuelSavingsEstimator.recommendationEligible(station: staleClosest, fuel: .e10,
+                                                                  baseline: baseline, now: now))
+    }
+
+    func testBestValueBaselineRequiresEligibleSelectedFuelAndUsableJourney() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        let recent = now.addingTimeInterval(-86_400).timeIntervalSince1970
+        let stale = now.addingTimeInterval(-40 * 86_400).timeIntervalSince1970
+        let stations = [
+            FuelStation(id: "wrong-fuel", name: "Wrong", brand: "", address: "", postcode: "", lat: 0, lng: 0,
+                        prices: [.diesel: 140], priceUpdated: recent),
+            FuelStation(id: "stale", name: "Stale", brand: "", address: "", postcode: "", lat: 0, lng: 0,
+                        prices: [.e10: 140], priceUpdated: stale),
+            FuelStation(id: "bad-journey", name: "Bad journey", brand: "", address: "", postcode: "", lat: 0, lng: 0,
+                        prices: [.e10: 141], priceUpdated: recent),
+            FuelStation(id: "eligible", name: "Eligible", brand: "", address: "", postcode: "", lat: 0, lng: 0,
+                        prices: [.e10: 145], priceUpdated: recent)
+        ]
+        let journeys: (FuelStation) -> FuelSavingsJourney? = { station in
+            self.straightLine(station.id == "wrong-fuel" ? 0.1 : station.id == "stale" ? 0.2 :
+                              station.id == "bad-journey" ? .infinity : 2)
+        }
+        XCTAssertEqual(FuelSavingsEstimator.bestValueBaselineStation(stations, fuel: .e10,
+                                                                       journeyMiles: journeys, now: now)?.id, "eligible")
+        XCTAssertNil(FuelSavingsEstimator.bestValueBaselineStation(Array(stations.prefix(2)), fuel: .e10,
+                                                                    journeyMiles: journeys, now: now))
+    }
+
     func testBaselineStationUsesTheSameJourneyValuesAsSavings() {
         let geographicallyNearest = station("geographically-nearest", price: 145.9)
         let roadNearest = station("road-nearest", price: 146.9)
@@ -350,8 +432,8 @@ final class FuelSavingsEstimateTests: XCTestCase {
         )
 
         XCTAssertEqual(availability?.result?.status, .baseline)
-        XCTAssertEqual(availability?.result?.headline(compact: true), "Closest station")
-        XCTAssertEqual(FuelSavingsStatus.baseline.displayName, "Closest station")
+        XCTAssertEqual(availability?.result?.headline(compact: true), "Closest eligible station")
+        XCTAssertEqual(FuelSavingsStatus.baseline.displayName, "Closest eligible station")
         XCTAssertEqual(availability?.result?.netSavingGBP, 0)
         XCTAssertEqual(availability?.result?.extraDistanceMiles, 0)
     }
@@ -403,7 +485,7 @@ final class FuelSavingsEstimateTests: XCTestCase {
 
     /// The exact strings the brief asks for.
     func testHeadlineWordingMatchesTheBrief() {
-        XCTAssertEqual(FuelSavingsResult.baselineHeadline, "Closest station")
+        XCTAssertEqual(FuelSavingsResult.baselineHeadline, "Closest eligible station")
         XCTAssertEqual(FuelSavingsResult.breakEvenHeadline, "Break even")
 
         let saving = FuelSavingsResult(fillLitres: 34.9,
@@ -427,10 +509,87 @@ final class FuelSavingsEstimateTests: XCTestCase {
 
     /// The sort must order by NET saving, not pump price: a pricier station can
     /// win when the cheaper one is far enough away.
+    func testBestValueAlertUsesClosestEligiblePriceAsBaseline() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        func priced(_ id: String, _ price: Double, _ daysOld: Double) -> FuelStation {
+            FuelStation(id: id, name: id, brand: "", address: "", postcode: "", lat: 53, lng: -1,
+                        prices: [.e10: price], priceUpdated: now.addingTimeInterval(-daysOld * 86_400).timeIntervalSince1970)
+        }
+        let stations = [priced("stale-closest", 199.9, 27), priced("eligible-closest", 170.9, 1),
+                        priced("eligible-cheaper", 150.9, 1)]
+        let settings = FuelSavingsSettings(enabled: true, mpg: 30,
+            preferredAmount: .init(value: 60, unit: .pounds))
+        let alert = FuelSavingsCalculator.bestValueAlertCandidate(
+            stations: stations, fuel: .e10, settings: settings, amount: settings.preferredAmount,
+            minimumNetSavingGBP: 1,
+            journeyMiles: { self.straightLine($0.id == "stale-closest" ? 0.8 : $0.id == "eligible-closest" ? 1.6 : 3) },
+            now: now)
+        XCTAssertEqual(alert?.station.id, "eligible-cheaper")
+    }
+
+    func testBestValueAlertDoesNotRecommendStaleCandidateOrStaleBaseline() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        func priced(_ id: String, _ price: Double, _ daysOld: Double) -> FuelStation {
+            FuelStation(id: id, name: id, brand: "", address: "", postcode: "", lat: 53, lng: -1,
+                        prices: [.e10: price], priceUpdated: now.addingTimeInterval(-daysOld * 86_400).timeIntervalSince1970)
+        }
+        let base = priced("base", 199.9, 1)
+        let stale = priced("stale", 129.9, 40)
+        let fresh = priced("fresh", 159.9, 1)
+        let settings = FuelSavingsSettings(enabled: true, mpg: 30, preferredAmount: .init(value: 60, unit: .pounds))
+        let choice = FuelSavingsCalculator.bestValueAlertCandidate(
+            stations: [base, stale, fresh], fuel: .e10, settings: settings,
+            amount: .init(value: 60, unit: .pounds), minimumNetSavingGBP: 1,
+            journeyMiles: { station in self.straightLine(station.id == "base" ? 0.8 : 2) }, now: now)
+        XCTAssertEqual(choice?.station.id, "fresh")
+        let noTrustedBaseline = FuelSavingsCalculator.bestValueAlertCandidate(
+            stations: [priced("base", 199.9, 40), fresh], fuel: .e10, settings: settings,
+            amount: .init(value: 60, unit: .pounds), minimumNetSavingGBP: 1,
+            journeyMiles: { station in self.straightLine(station.id == "base" ? 0.8 : 2) }, now: now)
+        XCTAssertNil(noTrustedBaseline)
+    }
+
+    func testStalePriceCannotLeadBestValueButRemainsVisible() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        let baseline = FuelStation(id: "base", name: "Baseline", brand: "", address: "", postcode: "", lat: 53, lng: -1,
+                                   prices: [.e10: 199.9], priceUpdated: now.addingTimeInterval(-86_400).timeIntervalSince1970)
+        let stale = FuelStation(id: "stale-cheap", name: "Stale", brand: "", address: "", postcode: "", lat: 53, lng: -1,
+                                prices: [.e10: 129.9], priceUpdated: now.addingTimeInterval(-40 * 86_400).timeIntervalSince1970)
+        let recent = FuelStation(id: "recent", name: "Recent", brand: "", address: "", postcode: "", lat: 53, lng: -1,
+                                 prices: [.e10: 170.9], priceUpdated: now.addingTimeInterval(-86_400).timeIntervalSince1970)
+        let ranked = FuelSavingsEstimator.ranked([stale, recent], fuel: .e10, baseline: baseline,
+                                                  settings: briefSettings, amount: briefAmount,
+                                                  journeyMiles: { _ in self.straightLine(0.8) }, now: now)
+        XCTAssertEqual(ranked.map(\.id), ["recent", "stale-cheap"])
+    }
+
+    func testNoFreshPriceComparisonUsesExplicitCheapestPriceFallback() {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        let staleTime = now.addingTimeInterval(-40 * 86_400).timeIntervalSince1970
+        let baseline = FuelStation(id: "baseline", name: "Baseline", brand: "", address: "", postcode: "",
+                                   lat: 53, lng: -1, prices: [.diesel: 199.9], priceUpdated: staleTime)
+        let cheapest = FuelStation(id: "cheapest", name: "Cheapest", brand: "", address: "", postcode: "",
+                                   lat: 53, lng: -1, prices: [.diesel: 129.9], priceUpdated: staleTime)
+        let near = FuelStation(id: "near", name: "Near", brand: "", address: "", postcode: "",
+                               lat: 53, lng: -1, prices: [.diesel: 170.9], priceUpdated: staleTime)
+        let ordered = FuelSavingsEstimator.ranked([near, baseline, cheapest], fuel: .diesel,
+            baseline: baseline, settings: briefSettings, amount: briefAmount,
+            journeyMiles: { station in self.straightLine(station.id == "cheapest" ? 250 : 1) }, now: now)
+        XCTAssertEqual(ordered.map(\.id), ["cheapest", "near", "baseline"])
+        XCTAssertFalse(FuelSavingsEstimator.recommendationEligible(station: ordered[0], fuel: .diesel,
+                                                                  baseline: baseline, now: now))
+    }
+
     func testSortingRanksByNetSavingNotPumpPrice() {
-        let baseline = station("baseline", price: 171.9)
-        let cheapButFar = station("cheap-but-far", price: 167.9)
-        let pricierButNear = station("pricier-but-near", price: 169.9)
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
+        func pricedStation(_ id: String, price: Double) -> FuelStation {
+            FuelStation(id: id, name: id, brand: "X", address: "", postcode: "",
+                        lat: 51.5, lng: -0.1, prices: [.e10: price],
+                        priceUpdated: nil, priceUpdatedByFuel: [.e10: now.timeIntervalSince1970])
+        }
+        let baseline = pricedStation("baseline", price: 171.9)
+        let cheapButFar = pricedStation("cheap-but-far", price: 167.9)
+        let pricierButNear = pricedStation("pricier-but-near", price: 169.9)
 
         let ranked = FuelSavingsEstimator.ranked(
             [baseline, cheapButFar, pricierButNear],
@@ -444,7 +603,7 @@ final class FuelSavingsEstimateTests: XCTestCase {
                 case "cheap-but-far": return self.straightLine(7.6)
                 default: return self.straightLine(1.2)
                 }
-            }
+            }, now: now
         )
 
         XCTAssertEqual(ranked.first?.id, "pricier-but-near",
@@ -454,6 +613,25 @@ final class FuelSavingsEstimateTests: XCTestCase {
 
     // MARK: Row copy
 
+    func testCompactComparisonLabelUsesClosestEligibleStationWording() {
+        XCTAssertEqual(
+            FuelSavingsFormat.comparisonLabel(status: .worthTheDrive),
+            "vs closest eligible station"
+        )
+        XCTAssertEqual(
+            FuelSavingsFormat.comparisonLabel(status: .notWorthTheDrive),
+            "vs closest eligible station"
+        )
+        XCTAssertEqual(
+            FuelSavingsFormat.comparisonLabel(status: .breakEven),
+            "vs closest eligible station"
+        )
+        XCTAssertEqual(
+            FuelSavingsFormat.comparisonLabel(status: .baseline),
+            "your baseline"
+        )
+    }
+
     /// The row's extra-driving caption must follow the DISPLAY unit: the stored
     /// figure is always miles, and converting by the current unit instead would
     /// leave a km user's figure unlabelled and 1.6× too large.
@@ -475,7 +653,7 @@ final class FuelSavingsEstimateTests: XCTestCase {
     }
 
     /// The baseline capsule has to say what it IS: it previously repeated the
-    /// status word above it ("Closest station" twice) and never explained that
+    /// status word above it ("Closest eligible station" twice) and never explained that
     /// the savings are measured against it.
     func testCapsuleHeadlineMarksTheBaselineAndKeepsTheEstimateMarker() {
         let baseline = FuelSavingsResult(
@@ -486,7 +664,7 @@ final class FuelSavingsEstimateTests: XCTestCase {
             netSavingGBP: 0,
             status: .baseline
         )
-        XCTAssertEqual(baseline.capsuleHeadline(), "Closest station · your baseline")
+        XCTAssertEqual(baseline.capsuleHeadline(), "Closest eligible station")
 
         let saving = FuelSavingsResult(
             fillLitres: 30,

FuelBoardTests/Tests/FuelBoardSharedTests/FuelSavingsTests.swift

@@ -110,10 +110,11 @@ final class FuelSavingsCalculatorTests: XCTestCase {
     }
 
     func testBestValueAlertCandidatePicksHighestNetSavingAboveThreshold() throws {
+        let now = Date(timeIntervalSince1970: 1_800_000_000)
         let stations = [
-            station("baseline", lat: 0, lng: 0, price: 160),
-            station("small", lat: 0, lng: 0, price: 154),
-            station("best", lat: 0, lng: 0, price: 148),
+            station("baseline", lat: 0, lng: 0, price: 160, priceUpdated: now.timeIntervalSince1970),
+            station("small", lat: 0, lng: 0, price: 154, priceUpdated: now.timeIntervalSince1970),
+            station("best", lat: 0, lng: 0, price: 148, priceUpdated: now.timeIntervalSince1970),
         ]
         let journeys = ["baseline": 2.0, "small": 4.0, "best": 6.0]
         let settings = FuelSavingsSettings(enabled: true, mpg: 45, preferredAmount: .init(value: 40, unit: .pounds))
@@ -123,7 +124,8 @@ final class FuelSavingsCalculatorTests: XCTestCase {
             settings: settings,
             amount: settings.preferredAmount,
             minimumNetSavingGBP: 1.0,
-            journeyMiles: { journeys[$0.id].map { FuelSavingsJourney(miles: $0, basis: .roadRoute) } }
+            journeyMiles: { journeys[$0.id].map { FuelSavingsJourney(miles: $0, basis: .roadRoute) } },
+            now: now
         )
         XCTAssertEqual(candidate?.station.id, "best")
         XCTAssertEqual(candidate?.result.status, .worthTheDrive)
@@ -137,12 +139,23 @@ final class FuelSavingsCalculatorTests: XCTestCase {
         XCTAssertEqual(FuelSavingsCalculator.sortedForWorthTheDrive([farther, nearer]).first?.stationID, "nearer")
     }
 
-    private func station(_ id: String, lat: Double, lng: Double, price: Double) -> FuelStation {
-        FuelStation(id: id, name: id, brand: id, address: "", postcode: "", lat: lat, lng: lng, prices: [.e10: price], priceUpdated: nil)
+    private func station(_ id: String, lat: Double, lng: Double, price: Double,
+                         priceUpdated: TimeInterval? = nil) -> FuelStation {
+        FuelStation(id: id, name: id, brand: id, address: "", postcode: "", lat: lat, lng: lng,
+                    prices: [.e10: price], priceUpdated: priceUpdated)
     }
 }
 
 final class FuelSavingsSettingsTests: XCTestCase {
+    func testSwitchingFillUnitStartsAnExplicitNewComparison() {
+        let budget = FuelSavingsFillAmount(value: 60, unit: .pounds)
+        let litres = FuelSavingsCalculator.newComparisonAmount(afterSwitching: budget, to: .litres)
+        XCTAssertEqual(litres, FuelSavingsFillAmount(value: 30, unit: .litres))
+        XCTAssertEqual(FuelSavingsCalculator.newComparisonAmount(afterSwitching: litres, to: .pounds),
+                       FuelSavingsFillAmount(value: 40, unit: .pounds))
+        XCTAssertEqual(FuelSavingsCalculator.newComparisonAmount(afterSwitching: budget, to: .pounds), budget)
+    }
+
     func testSettingsValidationRequiresEnabledMPGAndFillAmount() {
         XCTAssertFalse(FuelSavingsSettings(enabled: false, mpg: 45, preferredAmount: .init(value: 40, unit: .pounds)).isConfigured)
         XCTAssertFalse(FuelSavingsSettings(enabled: true, mpg: 0, preferredAmount: .init(value: 40, unit: .pounds)).isConfigured)

FuelBoardWatch Watch App/ContentView.swift

@@ -51,7 +51,7 @@ private enum WatchDistanceUnit: String, Codable {
     func format(km: Double) -> String {
         switch self {
         case .miles:
-            return String(format: "%.1f mi", km * 0.621371)
+            return String(format: "%.1f mi", km / 1.609344)
         case .kilometers:
             return String(format: "%.1f km", km)
         }

FuelBoardWidgets/FuelPriceWidget.swift

@@ -95,7 +95,8 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
             data: FuelPriceWidgetEntryData(
                 date: Date(), stations: Array(sample.prefix(8)),
                 fuel: .e10, sort: .cheapest, isFavourites: false,
-                location: nil, locationSource: "none", unit: unit
+                location: nil, locationSource: "none", unit: unit,
+                bestValueResult: nil
             )
         )
     }
@@ -146,8 +147,9 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
         // Per-widget config: fuel + sort + distance come from THIS widget instance.
         let fuel = FuelType(rawValue: configuration.fuel.rawValue) ?? .e10
         let isFavourites = configuration.sort == .favourites
-        let sort: SortMode = configuration.sort == .closest ? .closest : .cheapest
-        let radiusKM = Double(configuration.distance.miles) * 1.60934
+        let sort: SortMode = configuration.sort == .closest ? .closest :
+            (configuration.sort == .worthTheDrive ? .worthTheDrive : .cheapest)
+        let radiusKM = Double(configuration.distance.miles) * FuelSavingsCalculator.kilometresPerMile
 
         // 1) Try a fresh location fix (bounded to a few seconds). The fix's own
         // accuracy is kept: the extension runs its own CLLocationManager and is
@@ -200,6 +202,9 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
 
         // 3) Load + order stations per widget mode.
         let ordered: [FuelStation]
+        var bestValueResult: FuelSavingsResult?
+        var bestValuePriceConfidence: FuelPriceFreshness.ComparisonConfidence = .ineligible
+        var bestValuePriceWarning: String?
         if isFavourites {
             let favourites = FuelStore.loadFavourites()
                 .filter { $0.station.prices[$0.fuel] != nil }
@@ -265,7 +270,7 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
             let filtered = stations.filter { $0.prices[fuel] != nil }
             switch sort {
             case .closest:
-                // Nearest first; price only breaks ties.
+                // Closest first; price only breaks ties.
                 ordered = filtered.sorted { lhs, rhs in
                     if let origin {
                         let lDist = FuelStore.displayDistanceKM(station: lhs, userLat: origin.lat, userLng: origin.lng)
@@ -274,9 +279,67 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
                     }
                     return lhs.prices[fuel]! < rhs.prices[fuel]!
                 }
-            case .cheapest, .worthTheDrive:
-                // Cheapest first; distance only breaks ties. Worth-the-Drive is app-only;
-                // widgets fall back to cheapest ordering if a stored config ever carries it.
+            case .worthTheDrive:
+                guard let origin else {
+                    ordered = filtered.sorted { $0.prices[fuel]! < $1.prices[fuel]! }
+                    break
+                }
+                let journey: (FuelStation) -> FuelSavingsJourney? = { station in
+                    if let meters = FuelStore.roadJourneyMeters(for: station, userLat: origin.lat, userLng: origin.lng) {
+                        let confidence: JourneyConfidence = FuelStore.hasMeasuredReturnRoadDistance(
+                            for: station, userLat: origin.lat, userLng: origin.lng
+                        ) ? .confirmed : .estimated
+                        return FuelSavingsJourney(
+                            miles: meters / FuelSavingsCalculator.metresPerMile,
+                            basis: .roadRoute,
+                            confidence: confidence
+                        )
+                    }
+                    return FuelSavingsJourney(
+                        miles: FuelStore.displayDistanceKM(station: station, userLat: origin.lat, userLng: origin.lng) /
+                            FuelSavingsCalculator.kilometresPerMile * 2,
+                        basis: .straightLine,
+                        confidence: .estimated
+                    )
+                }
+                let settings = FuelStore.loadFuelSavingsSettings()
+                guard settings.isConfigured else {
+                    ordered = filtered.sorted { $0.prices[fuel]! < $1.prices[fuel]! }
+                    break
+                }
+                let amount = settings.preferredAmount
+                let baseline = FuelSavingsEstimator.bestValueBaselineStation(filtered, fuel: fuel,
+                                                                             journeyMiles: journey)
+                let ranked = FuelSavingsEstimator.ranked(
+                    filtered,
+                    fuel: fuel,
+                    baseline: baseline,
+                    settings: settings,
+                    amount: amount,
+                    journeyMiles: journey
+                )
+                ordered = ranked
+                if let first = ranked.first, let baseline {
+                    bestValuePriceConfidence = FuelPriceFreshness.comparisonConfidence(
+                        station: first, fuel: fuel, baseline: baseline)
+                    bestValuePriceWarning = FuelPriceFreshness.comparisonWarning(
+                        station: first, fuel: fuel, baseline: baseline)
+                }
+                if let first = ranked.first, let baseline,
+                   bestValuePriceConfidence != .ineligible {
+                    let baselineJourney = journey(baseline)
+                    let result = FuelSavingsEstimator.availability(
+                        station: first,
+                        fuel: fuel,
+                        baseline: baseline,
+                        settings: settings,
+                        amount: amount,
+                        journey: journey(first),
+                        baselineJourney: baselineJourney
+                    )
+                    bestValueResult = result?.result
+                }
+            case .cheapest:
                 ordered = filtered.sorted { lhs, rhs in
                     let lPrice = lhs.prices[fuel]!
                     let rPrice = rhs.prices[fuel]!
@@ -295,7 +358,9 @@ struct FuelPriceTimelineProvider<Configuration: WidgetConfigurationIntent & Widg
                 date: Date(), stations: Array(ordered.prefix(8)),
                 fuel: fuel, sort: sort, isFavourites: isFavourites,
                 location: origin, locationSource: source,
-                unit: unit
+                unit: unit, bestValueResult: bestValueResult,
+                bestValuePriceConfidence: bestValuePriceConfidence,
+                bestValuePriceWarning: bestValuePriceWarning
             )
         ), originSource)
     }

FuelBoardWidgets/WidgetConfigIntent.swift

@@ -30,6 +30,7 @@ enum WidgetFuel: String, AppEnum, CaseIterable, Codable {
 enum WidgetSort: String, AppEnum, CaseIterable, Codable {
     case cheapest
     case closest
+    case worthTheDrive
     case favourites
 
     static var typeDisplayRepresentation: TypeDisplayRepresentation = "Sort by"
@@ -37,6 +38,7 @@ enum WidgetSort: String, AppEnum, CaseIterable, Codable {
     static var caseDisplayRepresentations: [WidgetSort: DisplayRepresentation] = [
         .cheapest: "Cheapest",
         .closest: "Closest",
+        .worthTheDrive: "Best Value",
         .favourites: "Favourites",
     ]
 }
@@ -112,9 +114,17 @@ struct FuelBoardWidgetConfigurationIntent: WidgetConfigurationIntent, WidgetConf
                     \.$sort
                 }
             } otherwise: {
-                Summary("Show \(\.$fuel) by \(\.$sort)") {
-                    \.$fuel
-                    \.$sort
+                When(\.$sort, .equalTo, WidgetSort.worthTheDrive) {
+                    Summary("Show \(\.$fuel) by \(\.$sort) within \(\.$distance)") {
+                        \.$fuel
+                        \.$sort
+                        \.$distance
+                    }
+                } otherwise: {
+                    Summary("Show \(\.$fuel) by \(\.$sort)") {
+                        \.$fuel
+                        \.$sort
+                    }
                 }
             }
         }

Shared/FuelPriceFreshness.swift

@@ -0,0 +1,178 @@
+import Foundation
+
+enum FuelPriceTimestamp {
+    static func parse(_ value: String?) -> Date? {
+        guard let value, !value.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty else { return nil }
+        let formatter = ISO8601DateFormatter()
+        formatter.formatOptions = [.withInternetDateTime, .withFractionalSeconds]
+        return formatter.date(from: value) ?? {
+            formatter.formatOptions = [.withInternetDateTime]
+            return formatter.date(from: value)
+        }()
+    }
+}
+
+enum FuelPriceFreshness {
+    static let warningAge: TimeInterval = 7 * 24 * 60 * 60
+    static let staleAge: TimeInterval = 30 * 24 * 60 * 60
+    static let futureTolerance: TimeInterval = 5 * 60
+
+    enum Source: Equatable { case gradeSpecific, stationWide, unknown }
+    enum Status: Equatable { case fresh, warning, stale, unknown, invalid }
+    enum Confidence: Equatable { case verified, provisional, unavailable }
+    enum RecommendationEligibility: Equatable { case eligible, ineligible }
+
+    struct Assessment: Equatable {
+        let source: Source
+        let status: Status
+        let age: TimeInterval?
+        let confidence: Confidence
+        let recommendationEligibility: RecommendationEligibility
+        let warning: Bool
+
+        var isEligibleForBestValue: Bool {
+            recommendationEligibility == .eligible
+        }
+
+        /// The one age More info reports. Production data carries a single
+        /// station-wide timestamp per station, so there is no separate
+        /// grade-level age to show; an absent or unreadable timestamp reads
+        /// "Not provided" rather than implying freshness.
+        var updateAgeLabel: String {
+            guard let age else {
+                return String(localized: "Not provided", comment: "Price update time is missing")
+            }
+            return String(format: String(localized: "%@ ago", comment: "Price age, e.g. 28h ago"),
+                          Self.ageText(age))
+        }
+
+        var displayLabel: String {
+            switch (source, status, age) {
+            case (_, .unknown, _): return "Price age unknown"
+            case (_, .invalid, _): return "Price timestamp invalid"
+            case (_, .stale, let age?): return "Price updated \(Self.ageText(age)) ago · may be outdated"
+            case (.stationWide, _, let age?): return "Price updated \(Self.ageText(age)) ago · station-wide · provisional"
+            case (_, .warning, let age?): return "Price updated \(Self.ageText(age)) ago"
+            case (.gradeSpecific, .fresh, let age?): return "Price updated \(Self.ageText(age)) ago"
+            default: return "Price age unknown"
+            }
+        }
+
+        private static func ageText(_ age: TimeInterval) -> String {
+            let minutes = max(0, Int(age / 60))
+            if minutes < 60 { return "\(minutes)m" }
+            let hours = minutes / 60
+            if hours < 48 { return "\(hours)h" }
+            return "\(hours / 24)d"
+        }
+    }
+
+    static func assessment(for station: FuelStation, fuel: FuelType, now: Date = Date()) -> Assessment {
+        if station.priceUpdatedByFuelRaw?[fuel] != nil && station.priceUpdatedByFuel?[fuel] == nil {
+            return invalid(source: .gradeSpecific)
+        }
+        if let timestamp = station.priceUpdatedByFuel?[fuel] {
+            return assess(timestamp: timestamp, source: .gradeSpecific, now: now)
+        }
+        guard let timestamp = station.priceUpdated else { return unknown() }
+        return assess(timestamp: timestamp, source: .stationWide, now: now)
+    }
+
+    /// Recommendation gate for Best Value. A station-wide timestamp under
+    /// seven days can support a provisional estimate. Older station-wide
+    /// reports cannot establish grade recency; grade-specific timestamps may
+    /// remain eligible up to thirty days, but carry an age warning.
+    static func isEligibleForBestValue(station: FuelStation, fuel: FuelType,
+                                       now: Date = Date()) -> Bool {
+        assessment(for: station, fuel: fuel, now: now).isEligibleForBestValue
+    }
+
+    static func assessment(priceUpdated: String?, priceUpdatedByGrade: [String: String]?,
+                           fuel: FuelType, now: Date = Date()) -> Assessment {
+        if let raw = priceUpdatedByGrade?[fuel.rawValue] {
+            guard let date = FuelPriceTimestamp.parse(raw) else { return invalid(source: .gradeSpecific) }
+            return assess(timestamp: date.timeIntervalSince1970, source: .gradeSpecific, now: now)
+        }
+        guard let raw = priceUpdated else { return unknown() }
+        guard let date = FuelPriceTimestamp.parse(raw) else { return invalid() }
+        return assess(timestamp: date.timeIntervalSince1970, source: .stationWide, now: now)
+    }
+
+    static func assessment(priceUpdated: TimeInterval?, priceUpdatedByFuel: [FuelType: TimeInterval]?,
+                           fuel: FuelType, now: Date = Date()) -> Assessment {
+        if let timestamp = priceUpdatedByFuel?[fuel] {
+            return assess(timestamp: timestamp, source: .gradeSpecific, now: now)
+        }
+        guard let timestamp = priceUpdated else { return unknown() }
+        return assess(timestamp: timestamp, source: .stationWide, now: now)
+    }
+
+    /// Confidence for a monetary comparison requires both selected-grade prices.
+    /// Keep the eligibility and label decision together for app and widgets.
+    enum ComparisonConfidence: Equatable {
+        case verified, provisional, ineligible
+
+        static func assess(station: FuelStation, fuel: FuelType, baseline: FuelStation?, now: Date = Date()) -> Self {
+            FuelPriceFreshness.comparisonConfidence(station: station, fuel: fuel, baseline: baseline, now: now)
+        }
+
+        /// Only an ineligible comparison needs a line of its own. The capsule
+        /// already presents a provisional saving as an estimate, so a second
+        /// line saying so crowded the rows and the detail sheet without
+        /// changing anything the user could do.
+        var warningText: String? {
+            switch self {
+            case .verified, .provisional: return nil
+            case .ineligible: return String(localized: "Price age unavailable or too old — not a Best Value recommendation.")
+            }
+        }
+    }
+
+    /// A short line for a comparison that cannot be recommended at all; rows
+    /// stay quiet otherwise. Naming the fuel, and which side of the comparison
+    /// was weak, was noise once the saving is already labelled an estimate.
+    static func comparisonWarning(station: FuelStation, fuel: FuelType,
+                                  baseline: FuelStation?, now: Date = Date()) -> String? {
+        comparisonConfidence(station: station, fuel: fuel, baseline: baseline, now: now).warningText
+    }
+
+    static func comparisonConfidence(station: FuelStation, fuel: FuelType,
+                                     baseline: FuelStation?, now: Date = Date()) -> ComparisonConfidence {
+        guard let baseline,
+              let candidatePrice = station.prices[fuel], candidatePrice.isFinite, candidatePrice > 0,
+              let baselinePrice = baseline.prices[fuel], baselinePrice.isFinite, baselinePrice > 0
+        else { return .ineligible }
+        let candidate = assessment(for: station, fuel: fuel, now: now)
+        let reference = assessment(for: baseline, fuel: fuel, now: now)
+        guard candidate.isEligibleForBestValue, reference.isEligibleForBestValue else { return .ineligible }
+        if candidate.confidence == .verified, reference.confidence == .verified,
+           candidate.status == .fresh, reference.status == .fresh { return .verified }
+        return .provisional
+    }
+
+    private static func unknown() -> Assessment {
+        Assessment(source: .unknown, status: .unknown, age: nil,
+                   confidence: .unavailable, recommendationEligibility: .ineligible, warning: true)
+    }
+
+    private static func invalid(source: Source = .unknown) -> Assessment {
+        Assessment(source: source, status: .invalid, age: nil,
+                   confidence: .unavailable, recommendationEligibility: .ineligible, warning: true)
+    }
+
+    private static func assess(timestamp: TimeInterval, source: Source, now: Date) -> Assessment {
+        let age = now.timeIntervalSince1970 - timestamp
+        guard age >= -futureTolerance else {
+            return Assessment(source: source, status: .invalid, age: nil,
+                              confidence: .unavailable, recommendationEligibility: .ineligible, warning: true)
+        }
+        let boundedAge = max(0, age)
+        let status: Status = boundedAge > staleAge ? .stale : boundedAge > warningAge ? .warning : .fresh
+        let confidence: Confidence = source == .gradeSpecific ? .verified : .provisional
+        let eligible = status == .fresh || (source == .gradeSpecific && status == .warning)
+        return Assessment(source: source, status: status, age: boundedAge,
+                          confidence: confidence,
+                          recommendationEligibility: eligible ? .eligible : .ineligible,
+                          warning: source != .gradeSpecific || status != .fresh)
+    }
+}

Shared/FuelPriceProvider.swift

@@ -38,7 +38,9 @@ enum FuelPriceProvider {
                 lat: relay.lat ?? 0,
                 lng: relay.lng ?? 0,
                 prices: relay.allPrices,
-                priceUpdated: nil
+                    priceUpdated: relay.priceUpdatedDate?.timeIntervalSince1970,
+                    priceUpdatedByFuel: relay.priceUpdatedByFuel,
+                    priceUpdatedByFuelRaw: relay.priceUpdatedByFuelRaw
             )
         }
     }
@@ -65,6 +67,15 @@ enum FuelPriceProvider {
         return result
     }
 
+    static func fuelType(for grade: String) -> FuelType? {
+        switch grade.uppercased() {
+        case "E10": return .e10
+        case "E5": return .e5
+        case "DIESEL", "B7", "B7S", "B7P", "B10": return .diesel
+        default: return nil
+        }
+    }
+
     /// Decodes mirror envelope metadata (source, dataset update time) — the
     /// About section shows these so the user can see which data source is
     /// live and how fresh the GOV.UK data itself is. The fields are additive
@@ -106,6 +117,41 @@ private struct MirrorResponse: Codable {
         let lng: Double?
         let price: Double?
         let prices: [String: Double]?
+        let priceUpdated: String?
+        let priceUpdatedByGrade: [String: String]?
+        let priceUpdatedByFuelRawValues: [String: String]?
+
+        enum CodingKeys: String, CodingKey {
+            case id, name, brand, address, postcode, lat, lng, price, prices
+            case priceUpdated = "price_updated"
+            case priceUpdatedByGrade = "price_updated_by_grade"
+            case priceUpdatedByFuelRawValues = "price_updated_by_fuel"
+        }
+
+        var priceUpdatedDate: Date? {
+            FuelPriceTimestamp.parse(priceUpdated)
+        }
+
+        var priceUpdatedByFuelRaw: [FuelType: String]? {
+            let raw = priceUpdatedByGrade ?? priceUpdatedByFuelRawValues
+            guard let raw else { return nil }
+            let parsed = raw.reduce(into: [FuelType: String]()) { result, item in
+                guard let fuel = FuelPriceProvider.fuelType(for: item.key) else { return }
+                result[fuel] = item.value
+            }
+            return parsed.isEmpty ? nil : parsed
+        }
+
+        var priceUpdatedByFuel: [FuelType: TimeInterval]? {
+            let raw = priceUpdatedByGrade ?? priceUpdatedByFuelRawValues
+            guard let raw else { return nil }
+            let parsed = raw.reduce(into: [FuelType: TimeInterval]()) { result, item in
+                guard let fuel = FuelPriceProvider.fuelType(for: item.key),
+                      let date = FuelPriceTimestamp.parse(item.value) else { return }
+                result[fuel] = date.timeIntervalSince1970
+            }
+            return parsed.isEmpty ? nil : parsed
+        }
 
         /// Map mirror grade keys (E5/E10/DIESEL) to FuelType for ALL fuels the
         /// station sells — one fetch populates every fuel tab. Defensive guard:

Shared/FuelPriceWidgetViews.swift

@@ -29,11 +29,17 @@ struct FuelPriceWidgetEntryData {
     let date: Date
     let stations: [FuelStation]   // already filtered + sorted per config
     let fuel: FuelType
-    let sort: SortMode            // per-widget: cheapest | closest
-    let isFavourites: Bool        // favourites mode: pinned stations, cheapest-first
+    let sort: SortMode            // per-widget: cheapest | closest | Best Value
+    let isFavourites: Bool        // favourites mode: pinned stations
     let location: Coordinate?
     let locationSource: String    // "live" | "cached" | "none"
     let unit: DistanceUnit        // user's display unit for distances
+    let bestValueResult: FuelSavingsResult? // only populated for the small Best Value face
+    /// Both selected-fuel prices are assessed by the shared freshness policy.
+    var bestValuePriceConfidence: FuelPriceFreshness.ComparisonConfidence = .ineligible
+    /// Candidate-aware warning copy (names the fuel, and the baseline when the
+    /// baseline is the weak link). Falls back to the confidence's own text.
+    var bestValuePriceWarning: String? = nil
 }
 
 /// The widget face, parameterised by family so the app can preview it.
@@ -67,9 +73,11 @@ struct FuelPriceWidgetContent: View {
 
     private var heading: String {
         if entry.isFavourites { return "Favourite \(entry.fuel.displayName)" }
-        return entry.sort == .closest
-            ? "Closest \(entry.fuel.displayName)"
-            : "Cheapest \(entry.fuel.displayName)"
+        switch entry.sort {
+        case .closest: return "Closest \(entry.fuel.displayName)"
+        case .worthTheDrive: return "Best Value \(entry.fuel.displayName)"
+        case .cheapest: return "Cheapest \(entry.fuel.displayName)"
+        }
     }
 
     private var singleStation: some View {
@@ -85,7 +93,36 @@ struct FuelPriceWidgetContent: View {
             Text(station.name)
                 .font(.headline)
                 .lineLimit(1)
-            if let price = station.prices[entry.fuel] {
+            if entry.sort == .worthTheDrive, let result = entry.bestValueResult {
+                Text(result.headline(compact: true))
+                    .font(.title3.weight(.bold))
+                    .lineLimit(1)
+                Text(result.status == .baseline ? "your baseline" : "vs closest eligible station")
+                    .font(.caption2)
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
+                if let warning = entry.bestValuePriceWarning ?? entry.bestValuePriceConfidence.warningText {
+                    Text(warning)
+                        .font(.caption2)
+                        .foregroundStyle(.orange)
+                        .lineLimit(2)
+                }
+            } else if entry.sort == .worthTheDrive {
+                if let price = station.prices[entry.fuel] {
+                    FuelStore.priceTextAttributed(price, size: 26, weight: .bold, color: .green)
+                }
+                if entry.location == nil {
+                    Text("Best Value unavailable · location needed")
+                        .font(.caption2)
+                        .foregroundStyle(.orange)
+                        .lineLimit(2)
+                } else {
+                    Text("Best Value unavailable · price confidence insufficient")
+                        .font(.caption2)
+                        .foregroundStyle(.orange)
+                        .lineLimit(2)
+                }
+            } else if let price = station.prices[entry.fuel] {
                 FuelStore.priceTextAttributed(price, size: 26, weight: .bold, color: .green)
             }
             if let location = entry.location {
@@ -126,7 +163,9 @@ struct FuelPriceWidgetContent: View {
                     .font(.caption2)
                     .foregroundStyle(.secondary)
                 Spacer()
-                Text(entry.isFavourites ? "cheapest first"
+                Text(entry.sort == .worthTheDrive && entry.bestValuePriceConfidence == .ineligible
+                     ? "price order · Best Value unavailable"
+                     : entry.isFavourites ? "your order"
                      : (entry.locationSource == "none" ? "by price" : "near you"))
                     .font(.caption2)
                     .foregroundStyle(.secondary)

Shared/FuelSavings.swift

@@ -45,7 +45,7 @@ enum FuelSavingsStatus: String, Codable, Equatable {
     case breakEven
     case notWorthTheDrive
     /// The comparison baseline itself — the station every other saving is
-    /// measured against. Shown as "Closest station", never "Break even".
+    /// measured against. Shown as "Closest eligible station", never "Break even".
     case baseline
 
     var displayName: String {
@@ -143,6 +143,13 @@ enum FuelSavingsFormat {
             : "\(distanceText) extra return travel"
     }
 
+    /// Compact comparison copy kept outside the coloured verdict capsule.
+    /// "Closest" refers to the existing shortest-journey baseline selection;
+    /// it does not claim a straight-line comparison.
+    static func comparisonLabel(status: FuelSavingsStatus) -> String {
+        status == .baseline ? "your baseline" : "vs closest eligible station"
+    }
+
     /// VoiceOver form of `extraTravelLabel`. The abbreviation and the unit suffix
     /// are spoken as words ("Approximately 6.4 miles extra return travel") because
     /// synthesizers render "Approx." and "mi" inconsistently.
@@ -167,7 +174,7 @@ enum FuelSavingsFormat {
 
 extension FuelSavingsResult {
     /// Baseline row label — required wording.
-    static let baselineHeadline = "Closest station"
+    static let baselineHeadline = "Closest eligible station"
     /// Neutral result label — required wording.
     static let breakEvenHeadline = "Break even"
 
@@ -188,7 +195,7 @@ extension FuelSavingsResult {
     }
 
     /// Row headline, e.g. "£1.22 better off after travel", "£0.31 worse off after
-    /// travel", "Break even", "Closest station".
+    /// travel", "Break even", "Closest eligible station".
     ///
     /// Estimated comparisons are prefixed "Approx. " for positive/negative money
     /// results — the WORD, never a "~": a tilde reads as decoration (and assistive
@@ -215,13 +222,11 @@ extension FuelSavingsResult {
         headline().replacingOccurrences(of: "Approx. ", with: "Approximately ")
     }
 
-    /// Row capsule copy: the headline, plus what the baseline row IS. Without the
-    /// suffix the baseline capsule just repeated the status word above it
-    /// ("Closest station" twice) and said nothing about the saving being measured
-    /// against it.
+    /// Row capsule copy. The baseline relationship is shown as secondary text
+    /// beside the capsule in the station listing and detail summary, so the
+    /// capsule itself contains only the verdict.
     func capsuleHeadline() -> String {
-        let headline = headline(compact: true)
-        return status == .baseline ? "\(headline) · your baseline" : headline
+        headline(compact: true)
     }
 }
 
@@ -338,6 +343,19 @@ enum FuelSavingsCalculator {
         }
     }
 
+    /// Changing between a per-candidate monetary budget and a fixed litre
+    /// quantity has no lossless conversion across all stations. Start a new
+    /// comparison at that mode's stated default; the UI must tell the user
+    /// explicitly that the comparison basis changed and invite adjustment.
+    static func newComparisonAmount(afterSwitching amount: FuelSavingsFillAmount,
+                                    to unit: FuelSavingsFillUnit) -> FuelSavingsFillAmount {
+        guard amount.unit != unit else { return amount }
+        switch unit {
+        case .pounds: return FuelSavingsFillAmount(value: 40, unit: .pounds)
+        case .litres: return FuelSavingsFillAmount(value: 30, unit: .litres)
+        }
+    }
+
     static func convert(amount: FuelSavingsFillAmount,
                         to unit: FuelSavingsFillUnit,
                         referencePricePencePerLitre: Double) throws -> FuelSavingsFillAmount {
@@ -434,21 +452,24 @@ enum FuelSavingsCalculator {
         settings: FuelSavingsSettings,
         amount: FuelSavingsFillAmount,
         minimumNetSavingGBP: Double,
-        journeyMiles: (FuelStation) -> FuelSavingsJourney?
+        journeyMiles: (FuelStation) -> FuelSavingsJourney?,
+        now: Date = Date()
     ) -> BestValueAlertCandidate? {
         guard settings.isConfigured, minimumNetSavingGBP.isFinite else { return nil }
         let sellers = stations.filter { $0.prices[fuel] != nil }
         guard !sellers.isEmpty else { return nil }
-        let baseline = FuelSavingsEstimator.baselineStation(sellers, fuel: fuel, journeyMiles: journeyMiles)
+        let baseline = FuelSavingsEstimator.bestValueBaselineStation(sellers, fuel: fuel,
+                                                                     journeyMiles: journeyMiles, now: now)
+        guard let baseline else { return nil }
         var best: BestValueAlertCandidate?
         var bestDistance = Double.greatestFiniteMagnitude
         var bestPrice = Double.infinity
         var baselineJourneyCache: FuelSavingsJourney?
         var baselineJourneyLoaded = false
         for station in sellers {
+            guard FuelPriceFreshness.isEligibleForBestValue(station: station, fuel: fuel, now: now) else { continue }
             let journey = journeyMiles(station)
             let baselineJourney: FuelSavingsJourney? = {
-                guard let baseline else { return nil }
                 if baseline.id == station.id { return journey }
                 if !baselineJourneyLoaded {
                     baselineJourneyCache = journeyMiles(baseline)
@@ -492,12 +513,8 @@ enum FuelSavingsCalculator {
 /// Pure and injectable (no MapKit, CoreLocation or SwiftUI) so the ranking
 /// rules are unit tested directly.
 enum FuelSavingsEstimator {
-    /// Baseline station for Best Value: the station with the shortest journey
-    /// among stations that sell the selected fuel, using the SAME journey source
-    /// the savings calculation will use. This keeps the row labelled "Closest
-    /// station" and every "extra return travel" value tied to one
-    /// reference, instead of mixing a separate straight-line baseline with
-    /// road-route savings.
+    /// Closest priced station, irrespective of evidence age. Used for ordinary
+    /// Closest sorting, which must continue to include older prices.
     static func baselineStation(_ stations: [FuelStation],
                                 fuel: FuelType,
                                 journeyMiles: (FuelStation) -> FuelSavingsJourney?) -> FuelStation? {
@@ -515,6 +532,17 @@ enum FuelSavingsEstimator {
         return bestStation
     }
 
+    /// Closest selected-fuel seller with price evidence eligible for a Best Value
+    /// comparison. The ordinary Closest sort still includes every priced station.
+    static func bestValueBaselineStation(_ stations: [FuelStation],
+                                         fuel: FuelType,
+                                         journeyMiles: (FuelStation) -> FuelSavingsJourney?,
+                                         now: Date = Date()) -> FuelStation? {
+        baselineStation(stations.filter {
+            FuelPriceFreshness.comparisonConfidence(station: $0, fuel: fuel, baseline: $0, now: now) != .ineligible
+        }, fuel: fuel, journeyMiles: journeyMiles)
+    }
+
     /// Savings for a single station against `baseline`, or nil when there is
     /// nothing to show at all (feature off).
     static func availability(station: FuelStation,
@@ -556,20 +584,26 @@ enum FuelSavingsEstimator {
         }
     }
 
-    /// Ranks a whole pool for the Best Value sort.
-    ///
-    /// EVERY priced station in the pool gets an estimate, not just the handful
-    /// whose road routes happen to have been measured: journeys that have no
-    /// measured route fall back to a straight-line out-and-back estimate (see
-    /// `FuelSavingsDistanceBasis`). Capping this to a shortlist dropped cheaper
-    /// stations that were a few miles further away — the exact stations the
-    /// sort exists to surface — and left later pages with no savings at all.
+    /// Recommendation gate shared by Best Value order, widgets and alerts.
+    /// The baseline and candidate must both pass the selected-fuel freshness
+    /// policy. A recent station-wide timestamp remains provisional; missing,
+    /// invalid and over-threshold timestamps cannot lead a recommendation.
+    static func recommendationEligible(station: FuelStation, fuel: FuelType,
+                                       baseline: FuelStation?, now: Date = Date()) -> Bool {
+        FuelPriceFreshness.comparisonConfidence(station: station, fuel: fuel, baseline: baseline, now: now) != .ineligible
+    }
+
+    /// Ranks the whole station pool by valid full-precision savings. Stations
+    /// with an ineligible price stay visible behind eligible candidates; if
+    /// none qualify, the fallback order is selected-fuel pump price (then id),
+    /// not an untrustworthy savings order. The caller labels the fallback.
     static func ranked(_ stations: [FuelStation],
                        fuel: FuelType,
                        baseline: FuelStation?,
                        settings: FuelSavingsSettings,
                        amount: FuelSavingsFillAmount,
-                       journeyMiles: (FuelStation) -> FuelSavingsJourney?) -> [FuelStation] {
+                       journeyMiles: (FuelStation) -> FuelSavingsJourney?,
+                       now: Date = Date()) -> [FuelStation] {
         var journeys: [String: FuelSavingsJourney] = [:]
         journeys.reserveCapacity(stations.count)
         for station in stations {
@@ -577,7 +611,21 @@ enum FuelSavingsEstimator {
                 journeys[station.id] = journey
             }
         }
-        let baselineJourney = baseline.flatMap { journeys[$0.id] }
+        let baselineJourney = baseline.flatMap { journeys[$0.id] ?? journeyMiles($0) }
+        let hasEligibleComparison = stations.contains {
+            recommendationEligible(station: $0, fuel: fuel, baseline: baseline, now: now)
+        }
+        if !hasEligibleComparison {
+            // A net-savings order cannot be offered without trustworthy price
+            // evidence. Keep every station visible in an explicit price order;
+            // the caller labels the fallback as unavailable.
+            return stations.sorted { lhs, rhs in
+                let left = lhs.prices[fuel] ?? .infinity
+                let right = rhs.prices[fuel] ?? .infinity
+                if left != right { return left < right }
+                return lhs.id < rhs.id
+            }
+        }
         let ranked = stations.map { station -> FuelSavingsRankedStation in
             let journey = journeys[station.id]
             let availability = availability(station: station,
@@ -600,7 +648,17 @@ enum FuelSavingsEstimator {
                 order[rankedStation.stationID] = offset
             }
         }
+        // Compute freshness once per station, never in the O(n log n)
+        // comparator over the full UK pool.
+        var eligibility: [String: Bool] = [:]
+        eligibility.reserveCapacity(stations.count)
+        for station in stations {
+            eligibility[station.id] = recommendationEligible(station: station, fuel: fuel, baseline: baseline, now: now)
+        }
         return stations.sorted { lhs, rhs in
+            let leftEligible = eligibility[lhs.id] ?? false
+            let rightEligible = eligibility[rhs.id] ?? false
+            if leftEligible != rightEligible { return leftEligible }
             let left = order[lhs.id] ?? Int.max
             let right = order[rhs.id] ?? Int.max
             if left != right { return left < right }

Shared/FuelStore.swift

@@ -183,13 +183,13 @@ enum DistanceUnit: String, Codable, CaseIterable, Identifiable {
     /// shown in this unit, rounded to a whole number for picker labels:
     /// 5 miles -> "5" (miles unit) or "8" (km unit).
     func displayMiles(_ miles: Int) -> Int {
-        Int(fromKM(Double(miles) * 1.60934).rounded())
+        Int(fromKM(Double(miles) * FuelSavingsCalculator.kilometresPerMile).rounded())
     }
 
     /// Convert a value expressed in this unit to km.
     func toKM(_ value: Double) -> Double {
         switch self {
-        case .miles: return value * 1.60934
+        case .miles: return value * FuelSavingsCalculator.kilometresPerMile
         case .kilometers: return value
         }
     }
@@ -197,7 +197,7 @@ enum DistanceUnit: String, Codable, CaseIterable, Identifiable {
     /// Convert a km value to this unit.
     func fromKM(_ km: Double) -> Double {
         switch self {
-        case .miles: return km * 0.621371
+        case .miles: return km / FuelSavingsCalculator.kilometresPerMile
         case .kilometers: return km
         }
     }
@@ -275,6 +275,73 @@ struct FuelStation: Identifiable, Codable, Equatable {
     let prices: [FuelType: Double]
     /// Updated timestamp (seconds since 1970) — nil for sample data.
     let priceUpdated: TimeInterval?
+    /// Per-grade timestamps when the source provides them. A station-wide
+    /// `price_updated` must not be copied into this map: it does not prove that
+    /// every grade changed at that time.
+    let priceUpdatedByFuel: [FuelType: TimeInterval]?
+    /// Original per-grade timestamp text, retained so malformed source values
+    /// cannot silently fall back to a station-wide timestamp.
+    let priceUpdatedByFuelRaw: [FuelType: String]?
+
+    init(id: String, name: String, brand: String, address: String, postcode: String,
+         lat: Double, lng: Double, prices: [FuelType: Double],
+         priceUpdated: TimeInterval?, priceUpdatedByFuel: [FuelType: TimeInterval]? = nil,
+         priceUpdatedByFuelRaw: [FuelType: String]? = nil) {
+        self.id = id
+        self.name = name
+        self.brand = brand
+        self.address = address
+        self.postcode = postcode
+        self.lat = lat
+        self.lng = lng
+        self.prices = prices
+        self.priceUpdated = priceUpdated
+        self.priceUpdatedByFuel = priceUpdatedByFuel
+        self.priceUpdatedByFuelRaw = priceUpdatedByFuelRaw
+    }
+
+    private enum CodingKeys: String, CodingKey {
+        case id, name, brand, address, postcode, lat, lng, prices
+        case priceUpdated = "priceUpdated"
+        case priceUpdatedSnake = "price_updated"
+        case priceUpdatedByFuel = "priceUpdatedByFuel"
+        case priceUpdatedByFuelSnake = "price_updated_by_fuel"
+        case priceUpdatedByFuelRaw = "priceUpdatedByFuelRaw"
+        case priceUpdatedByFuelRawSnake = "price_updated_by_fuel_raw"
+    }
+
+    init(from decoder: Decoder) throws {
+        let values = try decoder.container(keyedBy: CodingKeys.self)
+        id = try values.decode(String.self, forKey: .id)
+        name = try values.decode(String.self, forKey: .name)
+        brand = try values.decode(String.self, forKey: .brand)
+        address = try values.decode(String.self, forKey: .address)
+        postcode = try values.decode(String.self, forKey: .postcode)
+        lat = try values.decode(Double.self, forKey: .lat)
+        lng = try values.decode(Double.self, forKey: .lng)
+        prices = try values.decode([FuelType: Double].self, forKey: .prices)
+        priceUpdated = try values.decodeIfPresent(TimeInterval.self, forKey: .priceUpdated)
+            ?? values.decodeIfPresent(TimeInterval.self, forKey: .priceUpdatedSnake)
+        priceUpdatedByFuel = try values.decodeIfPresent([FuelType: TimeInterval].self, forKey: .priceUpdatedByFuel)
+            ?? values.decodeIfPresent([FuelType: TimeInterval].self, forKey: .priceUpdatedByFuelSnake)
+        priceUpdatedByFuelRaw = try values.decodeIfPresent([FuelType: String].self, forKey: .priceUpdatedByFuelRaw)
+            ?? values.decodeIfPresent([FuelType: String].self, forKey: .priceUpdatedByFuelRawSnake)
+    }
+
+    func encode(to encoder: Encoder) throws {
+        var values = encoder.container(keyedBy: CodingKeys.self)
+        try values.encode(id, forKey: .id)
+        try values.encode(name, forKey: .name)
+        try values.encode(brand, forKey: .brand)
+        try values.encode(address, forKey: .address)
+        try values.encode(postcode, forKey: .postcode)
+        try values.encode(lat, forKey: .lat)
+        try values.encode(lng, forKey: .lng)
+        try values.encode(prices, forKey: .prices)
+        try values.encodeIfPresent(priceUpdated, forKey: .priceUpdated)
+        try values.encodeIfPresent(priceUpdatedByFuel, forKey: .priceUpdatedByFuel)
+        try values.encodeIfPresent(priceUpdatedByFuelRaw, forKey: .priceUpdatedByFuelRaw)
+    }
 
     /// Cheap haversine distance to a location, in km.
     func distanceKM(to lat2: Double, lng2: Double) -> Double {
@@ -979,7 +1046,7 @@ struct FuelStore {
 
     /// "Follow search" caps the geofence at 8 miles so a 10/15-mile Stations
     /// search never creates huge region-monitoring circles.
-    static let alertFollowCapKM: Double = 8 * 1.60934
+    static let alertFollowCapKM: Double = 8 * FuelSavingsCalculator.kilometresPerMile
 
     /// The effective alert radius: the manual radius, or — when alerts follow
     /// the Stations-tab search — that distance (miles, converted via the
@@ -1618,10 +1685,22 @@ struct FuelStore {
         // what the rows show.
         if accurateDistancesEnabled,
            accurateDistancesReady(userLat: userLat, userLng: userLng),
-           let meters = roadDistanceMeters(for: station, userLat: userLat, userLng: userLng) {
-            return StationDistanceDisplay(km: meters / 1000.0, isApproximate: false)
+           let entry = roadDistanceEntry(for: station, userLat: userLat, userLng: userLng) {
+            let returnKM = (entry.meters + (entry.returnMeters ?? entry.meters)) / 1000.0
+            return StationDistanceDisplay(
+                km: entry.meters / 1000.0,
+                isApproximate: false,
+                returnKM: returnKM,
+                returnIsApproximate: entry.returnMeters == nil
+            )
         }
-        return StationDistanceDisplay(km: station.distanceKM(to: userLat, lng2: userLng), isApproximate: true)
+        let km = station.distanceKM(to: userLat, lng2: userLng)
+        return StationDistanceDisplay(
+            km: km,
+            isApproximate: true,
+            returnKM: km * 2,
+            returnIsApproximate: true
+        )
     }
 
     /// Radius test on the SAME distance the UI shows. Filtering straight-line
@@ -1710,35 +1789,50 @@ struct RoadDistanceDiagnostics: Equatable {
 /// road distance or the straight-line fallback. The confidence travels WITH the
 /// value, so a label can never claim a confidence the figure doesn't have.
 struct StationDistanceDisplay: Equatable {
-    let km: Double
-    let isApproximate: Bool
+let km: Double
+let isApproximate: Bool
+let returnKM: Double
+let returnIsApproximate: Bool
 
-    /// Row/sheet label: a straight-line fallback is marked "Approx." so a figure
-    /// that is NOT a routed road distance can never be read as one, and a cached
-    /// road distance stays a bare figure. It updates by itself once routing lands,
-    /// because `FuelStore.stationDistanceDisplay` re-reads the cache every call.
-    func label(unit: DistanceUnit) -> String {
-        let text = unit.format(km)
-        return isApproximate ? "Approx. \(text)" : text
-    }
+init(km: Double,
+     isApproximate: Bool,
+     returnKM: Double? = nil,
+     returnIsApproximate: Bool? = nil) {
+    self.km = km
+    self.isApproximate = isApproximate
+    self.returnKM = returnKM ?? km * 2
+    self.returnIsApproximate = returnIsApproximate ?? isApproximate
+}
 
-    /// Row/sheet label that keeps the one-way station distance primary, then
-    /// adds the out-and-back distance in brackets. This matches Best Value's
-    /// "extra return travel" basis without changing the actual distance model.
-    func labelWithReturn(unit: DistanceUnit) -> String {
-        "\(label(unit: unit)) (\(unit.format(km * 2)) return)"
-    }
+/// Row/sheet label: a straight-line fallback is marked "Approx." so a figure
+/// that is NOT a routed road distance can never be read as one, and a cached
+/// road distance stays a bare figure. It updates by itself once routing lands,
+/// because `FuelStore.stationDistanceDisplay` re-reads the cache every call.
+func label(unit: DistanceUnit) -> String {
+    let text = unit.format(km)
+    return isApproximate ? "Approx. \(text)" : text
+}
 
-    /// VoiceOver form of `label(unit:)`.
-    func spokenLabel(unit: DistanceUnit) -> String {
-        let text = unit.spoken(km)
-        return isApproximate ? "Approximately \(text)" : text
-    }
+/// Row/sheet label that keeps the one-way station distance primary, then
+/// adds the independently measured or estimated out-and-back distance.
+func labelWithReturn(unit: DistanceUnit) -> String {
+    let returnText = unit.format(returnKM)
+    let returnLabel = returnIsApproximate ? "Approx. \(returnText)" : returnText
+    return "\(label(unit: unit)) (\(returnLabel) return)"
+}
 
-    /// VoiceOver form of `labelWithReturn(unit:)`.
-    func spokenLabelWithReturn(unit: DistanceUnit) -> String {
-        "\(spokenLabel(unit: unit)), \(unit.spoken(km * 2)) return"
-    }
+/// VoiceOver form of `label(unit:)`.
+func spokenLabel(unit: DistanceUnit) -> String {
+    let text = unit.spoken(km)
+    return isApproximate ? "Approximately \(text)" : text
+}
+
+/// VoiceOver form of `labelWithReturn(unit:)`.
+func spokenLabelWithReturn(unit: DistanceUnit) -> String {
+    let returnText = unit.spoken(returnKM)
+    let returnLabel = returnIsApproximate ? "Approximately \(returnText)" : returnText
+    return "\(spokenLabel(unit: unit)), \(returnLabel) return"
+}
 }
 
 /// Cached Apple-Maps road distances for nearby stations (see

Shared/SiriCheapestLookup.swift

@@ -21,7 +21,7 @@ enum SiriCheapestLookup {
         lng: Double,
         withinMiles: Double
     ) -> FuelStation? {
-        let radiusKM = withinMiles * 1.60934
+        let radiusKM = withinMiles * FuelSavingsCalculator.kilometresPerMile
         // Same radius rule as the app list: the distance the answer would SHOW
         // (cached road route where there is one).
         return stations